22 files changed, 1968 insertions, 4 deletions

diff --git a/indra/newview/CMakeLists.txt b/indra/newview/CMakeLists.txt
index 859ccbd4cd..ec27b3d415 100644
--- a/indra/newview/CMakeLists.txt
+++ b/indra/newview/CMakeLists.txt
@@ -727,6 +727,11 @@ set(viewer_SOURCE_FILES
     llxmlrpctransaction.cpp
     noise.cpp
     pipeline.cpp
+    rlvactions.cpp
+    rlvcommon.cpp
+    rlvfloaters.cpp
+    rlvhelper.cpp
+    rlvhandler.cpp
     )
 
 set(VIEWER_BINARY_NAME "secondlife-bin" CACHE STRING
@@ -1387,6 +1392,12 @@ set(viewer_HEADER_FILES
     llxmlrpctransaction.h
     noise.h
     pipeline.h
+    rlvdefines.h
+    rlvactions.h
+    rlvcommon.h
+    rlvfloaters.h
+    rlvhelper.h
+    rlvhandler.h
     roles_constants.h
     VertexCache.h
     VorbisFramework.h
diff --git a/indra/newview/app_settings/settings.xml b/indra/newview/app_settings/settings.xml
index 82eb98b06b..5f672cc218 100644
--- a/indra/newview/app_settings/settings.xml
+++ b/indra/newview/app_settings/settings.xml
@@ -9887,6 +9887,83 @@
 			<key>Value</key>
 			<string>https://feedback.secondlife.com/</string>
 		</map>
+    <key>RestrainedLove</key>
+    <map>
+      <key>Comment</key>
+      <string>Toggles RLVa features (requires restart)</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <boolean>0</boolean>
+    </map>
+    <key>RestrainedLoveDebug</key>
+    <map>
+      <key>Comment</key>
+      <string>Toggles RLVa debug mode (displays the commands when in debug mode)</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <boolean>0</boolean>
+    </map>
+    <key>RLVaBlockedExperiences</key>
+    <map>
+      <key>Comment</key>
+      <string>List of experiences blocked from interacting with RLVa</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>String</string>
+      <key>Value</key>
+      <string>bfe25fb4-222c-11e5-85a2-fa4c4ccaa202</string>
+    </map>
+    <key>RLVaDebugHideUnsetDuplicate</key>
+    <map>
+      <key>Comment</key>
+      <string>Suppresses reporting "unset" or "duplicate" command restrictions when RestrainedLoveDebug is TRUE</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <boolean>0</boolean>
+    </map>
+    <key>RLVaEnableTemporaryAttachments</key>
+    <map>
+      <key>Comment</key>
+      <string>Allows temporary attachments (regardless of origin) to issue RLV commands</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <boolean>1</boolean>
+    </map>
+    <key>RLVaExperimentalCommands</key>
+    <map>
+      <key>Comment</key>
+      <string>Enables the experimental command set</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <boolean>1</boolean>
+    </map>
+    <key>RLVaTopLevelMenu</key>
+    <map>
+      <key>Comment</key>
+      <string>Show the RLVa specific menu as a top level menu</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <boolean>1</boolean>
+    </map>
 	<key>RevokePermsOnStopAnimation</key>
     <map>
       <key>Comment</key>
diff --git a/indra/newview/llappviewer.cpp b/indra/newview/llappviewer.cpp
index 764e52accb..3c748b7b06 100644
--- a/indra/newview/llappviewer.cpp
+++ b/indra/newview/llappviewer.cpp
@@ -250,6 +250,10 @@ using namespace LL;
 #include "llcoproceduremanager.h"
 #include "llviewereventrecorder.h"
 
+#include "rlvactions.h"
+#include "rlvcommon.h"
+#include "rlvhandler.h"
+
 // *FIX: These extern globals should be cleaned up.
 // The globals either represent state/config/resource-storage of either
 // this app, or another 'component' of the viewer. App globals should be
@@ -1718,6 +1722,9 @@ bool LLAppViewer::cleanup()
     //ditch LLVOAvatarSelf instance
     gAgentAvatarp = NULL;
 
+    // Sanity check to catch cases where someone forgot to do an RlvActions::isRlvEnabled() check
+    LL_ERRS_IF(!RlvHandler::isEnabled() && RlvHandler::instanceExists()) << "RLV handler instance exists even though RLVa is disabled" << LL_ENDL;
+
     LLNotifications::instance().clear();
 
     // workaround for DEV-35406 crash on shutdown
@@ -3341,6 +3348,7 @@ LLSD LLAppViewer::getViewerInfo() const
     }
 #endif
 
+    info["RLV_VERSION"] = RlvActions::isRlvEnabled() ? Rlv::Strings::getVersionAbout() : "(disabled)";
     info["OPENGL_VERSION"] = ll_safe_string((const char*)(glGetString(GL_VERSION)));
 
     // Settings
diff --git a/indra/newview/llstartup.cpp b/indra/newview/llstartup.cpp
index b32b80331a..3b027df460 100644
--- a/indra/newview/llstartup.cpp
+++ b/indra/newview/llstartup.cpp
@@ -205,6 +205,7 @@
 #include "threadpool.h"
 #include "llperfstats.h"
 
+#include "rlvhandler.h"
 
 #if LL_WINDOWS
 #include "lldxhardware.h"
@@ -876,6 +877,8 @@ bool idle_startup()
             return false;
         }
 
+        RlvHandler::setEnabled(gSavedSettings.get<bool>(Rlv::Settings::Main));
+
         // reset the values that could have come in from a slurl
         // DEV-42215: Make sure they're not empty -- gUserCredential
         // might already have been set from gSavedSettings, and it's too bad
diff --git a/indra/newview/llviewercontrol.cpp b/indra/newview/llviewercontrol.cpp
index 865d7fd442..f8a315d4d8 100644
--- a/indra/newview/llviewercontrol.cpp
+++ b/indra/newview/llviewercontrol.cpp
@@ -76,6 +76,7 @@
 #include "llslurl.h"
 #include "llstartup.h"
 #include "llperfstats.h"
+#include "rlvcommon.h"
 
 // Third party library includes
 #include <boost/algorithm/string.hpp>
@@ -932,6 +933,8 @@ void settings_setup_listeners()
     setting_setup_signal_listener(gSavedSettings, "TerrainPaintBitDepth", handleSetShaderChanged);
 
     setting_setup_signal_listener(gSavedPerAccountSettings, "AvatarHoverOffsetZ", handleAvatarHoverOffsetChanged);
+
+    setting_setup_signal_listener(gSavedSettings, Rlv::Settings::TopLevelMenu, Rlv::Util::menuToggleVisible);
 }
 
 #if TEST_CACHED_CONTROL
diff --git a/indra/newview/llviewerfloaterreg.cpp b/indra/newview/llviewerfloaterreg.cpp
index ef68609182..3f2d01ee33 100644
--- a/indra/newview/llviewerfloaterreg.cpp
+++ b/indra/newview/llviewerfloaterreg.cpp
@@ -175,6 +175,7 @@
 #include "llpreviewtexture.h"
 #include "llscriptfloater.h"
 #include "llsyswellwindow.h"
+#include "rlvfloaters.h"
 
 // *NOTE: Please add files in alphabetical order to keep merges easy.
 
@@ -480,6 +481,7 @@ void LLViewerFloaterReg::registerFloaters()
     LLFloaterReg::add("region_debug_console", "floater_region_debug_console.xml", (LLFloaterBuildFunc)&LLFloaterReg::build<LLFloaterRegionDebugConsole>);
     LLFloaterReg::add("region_info", "floater_region_info.xml", (LLFloaterBuildFunc)&LLFloaterReg::build<LLFloaterRegionInfo>);
     LLFloaterReg::add("region_restarting", "floater_region_restarting.xml", (LLFloaterBuildFunc)&LLFloaterReg::build<LLFloaterRegionRestarting>);
+    LLFloaterReg::add("rlv_console", "floater_rlv_console.xml", (LLFloaterBuildFunc)&LLFloaterReg::build<Rlv::FloaterConsole>);
 
     LLFloaterReg::add("script_debug", "floater_script_debug.xml", (LLFloaterBuildFunc)&LLFloaterReg::build<LLFloaterScriptDebug>);
     LLFloaterReg::add("script_debug_output", "floater_script_debug_panel.xml", (LLFloaterBuildFunc)&LLFloaterReg::build<LLFloaterScriptDebugOutput>);
diff --git a/indra/newview/llviewermenu.cpp b/indra/newview/llviewermenu.cpp
index df60130c9f..dbd3478637 100644
--- a/indra/newview/llviewermenu.cpp
+++ b/indra/newview/llviewermenu.cpp
@@ -147,6 +147,7 @@
 #include "llviewershadermgr.h"
 #include "gltfscenemanager.h"
 #include "gltf/asset.h"
+#include "rlvcommon.h"
 
 using namespace LLAvatarAppearanceDefines;
 
@@ -6247,6 +6248,8 @@ void show_debug_menus()
         gMenuBarView->setItemVisible("Advanced", debug);
 //      gMenuBarView->setItemEnabled("Advanced", debug); // Don't disable Advanced keyboard shortcuts when hidden
 
+		Rlv::Util::menuToggleVisible();
+
         gMenuBarView->setItemVisible("Debug", qamode);
         gMenuBarView->setItemEnabled("Debug", qamode);
 
diff --git a/indra/newview/llviewermessage.cpp b/indra/newview/llviewermessage.cpp
index 0861b439eb..dc2258644f 100644
--- a/indra/newview/llviewermessage.cpp
+++ b/indra/newview/llviewermessage.cpp
@@ -118,6 +118,8 @@
 #include "llpanelplaceprofile.h"
 #include "llviewerregion.h"
 #include "llfloaterregionrestarting.h"
+#include "rlvactions.h"
+#include "rlvhandler.h"
 
 #include "llnotificationmanager.h" //
 #include "llexperiencecache.h"
@@ -2382,15 +2384,16 @@ void process_chat_from_simulator(LLMessageSystem *msg, void **user_data)
     }
 
     bool is_audible = (CHAT_AUDIBLE_FULLY == chat.mAudible);
+    bool show_script_chat_particles = chat.mSourceType == CHAT_SOURCE_OBJECT
+        && chat.mChatType != CHAT_TYPE_DEBUG_MSG
+        && gSavedSettings.getBOOL("EffectScriptChatParticles");
     chatter = gObjectList.findObject(from_id);
     if (chatter)
     {
         chat.mPosAgent = chatter->getPositionAgent();
 
         // Make swirly things only for talking objects. (not script debug messages, though)
-        if (chat.mSourceType == CHAT_SOURCE_OBJECT
-            && chat.mChatType != CHAT_TYPE_DEBUG_MSG
-            && gSavedSettings.getBOOL("EffectScriptChatParticles") )
+        if (show_script_chat_particles && (!RlvActions::isRlvEnabled() || CHAT_TYPE_OWNER != chat.mChatType) )
         {
             LLPointer<LLViewerPartSourceChat> psc = new LLViewerPartSourceChat(chatter->getPositionAgent());
             psc->setSourceObject(chatter);
@@ -2470,8 +2473,25 @@ void process_chat_from_simulator(LLMessageSystem *msg, void **user_data)
             case CHAT_TYPE_WHISPER:
                 chat.mText = LLTrans::getString("whisper") + " ";
                 break;
-            case CHAT_TYPE_DEBUG_MSG:
             case CHAT_TYPE_OWNER:
+                if (RlvActions::isRlvEnabled())
+                {
+                    if (RlvHandler::instance().handleSimulatorChat(mesg, chat, chatter))
+                    {
+                        break;
+                    }
+                    else if (show_script_chat_particles)
+                    {
+                        LLPointer<LLViewerPartSourceChat> psc = new LLViewerPartSourceChat(chatter->getPositionAgent());
+                        psc->setSourceObject(chatter);
+                        psc->setColor(color);
+                        //We set the particles to be owned by the object's owner,
+                        //just in case they should be muted by the mute list
+                        psc->setOwnerUUID(owner_id);
+                        LLViewerPartSim::getInstance()->addPartSource(psc);
+                    }
+                }
+            case CHAT_TYPE_DEBUG_MSG:
             case CHAT_TYPE_NORMAL:
             case CHAT_TYPE_DIRECT:
                 break;
diff --git a/indra/newview/rlvactions.cpp b/indra/newview/rlvactions.cpp
new file mode 100644
index 0000000000..110beeafc0
--- /dev/null
+++ b/indra/newview/rlvactions.cpp
@@ -0,0 +1,42 @@
+/**
+ * @file rlvactions.cpp
+ * @author Kitty Barnett
+ * @brief RLVa public facing helper class to easily make RLV checks
+ *
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2024, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#include "llviewerprecompiledheaders.h"
+
+#include "rlvactions.h"
+#include "rlvhandler.h"
+
+// ============================================================================
+// Helper functions
+//
+
+bool RlvActions::isRlvEnabled()
+{
+    return RlvHandler::isEnabled();
+}
+
+// ============================================================================
diff --git a/indra/newview/rlvactions.h b/indra/newview/rlvactions.h
new file mode 100644
index 0000000000..cb0df95e37
--- /dev/null
+++ b/indra/newview/rlvactions.h
@@ -0,0 +1,46 @@
+/**
+ * @file rlvactions.h
+ * @author Kitty Barnett
+ * @brief RLVa public facing helper class to easily make RLV checks
+ *
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2024, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#pragma once
+
+// ============================================================================
+// RlvActions - developer-friendly non-RLVa code facing class, use in lieu of RlvHandler whenever possible
+//
+
+class RlvActions
+{
+    // ================
+    // Helper functions
+    // ================
+public:
+    /*
+     * Convenience function to check if RLVa is enabled without having to include rlvhandler.h
+     */
+    static bool isRlvEnabled();
+};
+
+// ============================================================================
diff --git a/indra/newview/rlvcommon.cpp b/indra/newview/rlvcommon.cpp
new file mode 100644
index 0000000000..4140659715
--- /dev/null
+++ b/indra/newview/rlvcommon.cpp
@@ -0,0 +1,134 @@
+/**
+ * @file rlvcommon.h
+ * @author Kitty Barnett
+ * @brief RLVa helper functions and constants used throughout the viewer
+ *
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2024, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#include "llviewerprecompiledheaders.h"
+
+#include "llagent.h"
+#include "llchat.h"
+#include "lldbstrings.h"
+#include "llversioninfo.h"
+#include "llviewermenu.h"
+#include "llviewerstats.h"
+#include "message.h"
+#include <boost/algorithm/string.hpp>
+
+#include "rlvcommon.h"
+
+#include "llviewercontrol.h"
+#include "rlvhandler.h"
+
+using namespace Rlv;
+
+// ============================================================================
+// RlvStrings
+//
+
+std::string Strings::getVersion(bool wants_legacy)
+{
+    return llformat("%s viewer v%d.%d.%d (RLVa %d.%d.%d)",
+        !wants_legacy ? "RestrainedLove" : "RestrainedLife",
+        SpecVersion::Major, SpecVersion::Minor, SpecVersion::Patch,
+        ImplVersion::Major, ImplVersion::Minor, ImplVersion::Patch);
+}
+
+std::string Strings::getVersionAbout()
+{
+    return llformat("RLV v%d.%d.%d / RLVa v%d.%d.%d.%d",
+        SpecVersion::Major, SpecVersion::Minor, SpecVersion::Patch,
+        ImplVersion::Major, ImplVersion::Minor, ImplVersion::Patch, LLVersionInfo::instance().getBuild());
+}
+
+std::string Strings::getVersionNum()
+{
+    return llformat("%d%02d%02d%02d",
+        SpecVersion::Major, SpecVersion::Minor, SpecVersion::Patch, SpecVersion::Build);
+}
+
+std::string Strings::getVersionImplNum()
+{
+    return llformat("%d%02d%02d%02d",
+        ImplVersion::Major, ImplVersion::Minor, ImplVersion::Patch, ImplVersion::ImplId);
+}
+
+// ============================================================================
+// RlvUtil
+//
+
+void Util::menuToggleVisible()
+{
+    bool isTopLevel = gSavedSettings.getBOOL(Settings::TopLevelMenu);
+    bool isRlvEnabled = RlvHandler::isEnabled();
+
+    LLMenuGL* menuRLVaMain = gMenuBarView->findChildMenuByName("RLVa Main", false);
+    LLMenuGL* menuAdvanced = gMenuBarView->findChildMenuByName("Advanced", false);
+    LLMenuGL* menuRLVaEmbed= menuAdvanced->findChildMenuByName("RLVa Embedded", false);
+
+    gMenuBarView->setItemVisible("RLVa Main", isRlvEnabled && isTopLevel);
+    menuAdvanced->setItemVisible("RLVa Embedded", isRlvEnabled && !isTopLevel);
+
+    if ( isRlvEnabled && menuRLVaMain && menuRLVaEmbed &&
+         ( (isTopLevel && 1 == menuRLVaMain->getItemCount()) || (!isTopLevel && 1 == menuRLVaEmbed->getItemCount())) )
+    {
+        LLMenuGL* menuFrom = isTopLevel ? menuRLVaEmbed : menuRLVaMain;
+        LLMenuGL* menuTo = isTopLevel ? menuRLVaMain : menuRLVaEmbed;
+        while (LLMenuItemGL* pItem = menuFrom->getItem(1))
+        {
+            menuFrom->removeChild(pItem);
+            menuTo->addChild(pItem);
+            pItem->updateBranchParent(menuTo);
+        }
+    }
+}
+
+bool Util::parseStringList(const std::string& strInput, std::vector<std::string>& optionList, std::string_view strSeparator)
+{
+    if (!strInput.empty())
+        boost::split(optionList, strInput, boost::is_any_of(strSeparator));
+    return !optionList.empty();
+}
+
+bool Util::sendChatReply(S32 nChannel, const std::string& strUTF8Text)
+{
+    if (!isValidReplyChannel(nChannel))
+        return false;
+
+    // Copy/paste from send_chat_from_viewer()
+    gMessageSystem->newMessageFast(_PREHASH_ChatFromViewer);
+    gMessageSystem->nextBlockFast(_PREHASH_AgentData);
+    gMessageSystem->addUUIDFast(_PREHASH_AgentID, gAgent.getID());
+    gMessageSystem->addUUIDFast(_PREHASH_SessionID, gAgent.getSessionID());
+    gMessageSystem->nextBlockFast(_PREHASH_ChatData);
+    gMessageSystem->addStringFast(_PREHASH_Message, utf8str_truncate(strUTF8Text, MAX_MSG_STR_LEN));
+    gMessageSystem->addU8Fast(_PREHASH_Type, CHAT_TYPE_SHOUT);
+    gMessageSystem->addS32("Channel", nChannel);
+    gAgent.sendReliableMessage();
+    add(LLStatViewer::CHAT_COUNT, 1);
+
+    return true;
+}
+
+// ============================================================================
diff --git a/indra/newview/rlvcommon.h b/indra/newview/rlvcommon.h
new file mode 100644
index 0000000000..6f1bbbbdc6
--- /dev/null
+++ b/indra/newview/rlvcommon.h
@@ -0,0 +1,72 @@
+/**
+ * @file rlvcommon.h
+ * @author Kitty Barnett
+ * @brief RLVa helper functions and constants used throughout the viewer
+ *
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2024, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#pragma once
+
+#include "rlvdefines.h"
+
+namespace Rlv
+{
+    // ============================================================================
+    // RlvStrings
+    //
+
+    class Strings
+    {
+    public:
+        static std::string        getVersion(bool wants_legacy);
+        static std::string        getVersionAbout();
+        static std::string        getVersionImplNum();
+        static std::string        getVersionNum();
+    };
+
+    // ============================================================================
+    // RlvUtil
+    //
+
+    namespace Util
+    {
+        bool isValidReplyChannel(S32 nChannel, bool isLoopback = false);
+        void menuToggleVisible();
+        bool parseStringList(const std::string& strInput, std::vector<std::string>& optionList, std::string_view strSeparator = Constants::OptionSeparator);
+        bool sendChatReply(S32 nChannel, const std::string& strUTF8Text);
+        bool sendChatReply(const std::string& strChannel, const std::string& strUTF8Text);
+    };
+
+    inline bool Util::isValidReplyChannel(S32 nChannel, bool isLoopback)
+    {
+        return (nChannel > (!isLoopback ? 0 : -1)) && (CHAT_CHANNEL_DEBUG != nChannel);
+    }
+
+    inline bool Util::sendChatReply(const std::string& strChannel, const std::string& strUTF8Text)
+    {
+        S32 nChannel;
+        return LLStringUtil::convertToS32(strChannel, nChannel) ? sendChatReply(nChannel, strUTF8Text) : false;
+    }
+
+    // ============================================================================
+}
diff --git a/indra/newview/rlvdefines.h b/indra/newview/rlvdefines.h
new file mode 100644
index 0000000000..15baf1ba49
--- /dev/null
+++ b/indra/newview/rlvdefines.h
@@ -0,0 +1,195 @@
+/**
+ * @file rlvdefines.h
+ * @author Kitty Barnett
+ * @brief RLVa common defines, constants and enums
+ *
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2024, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#pragma once
+
+// ============================================================================
+// Defines
+//
+
+// Defining these makes it easier if we ever need to change our tag
+#define RLV_WARNS		LL_WARNS("RLV")
+#define RLV_INFOS		LL_INFOS("RLV")
+#define RLV_DEBUGS		LL_DEBUGS("RLV")
+#define RLV_ENDL		LL_ENDL
+#define RLV_VERIFY(f)	(f)
+
+#define RLV_DEBUG
+#if LL_RELEASE_WITH_DEBUG_INFO || LL_DEBUG
+    // Make sure we halt execution on errors
+    #define RLV_ERRS				LL_ERRS("RLV")
+    // Keep our asserts separate from LL's
+    #define RLV_ASSERT(f)			if (!(f)) { RLV_ERRS << "ASSERT (" << #f << ")" << RLV_ENDL; }
+    #define RLV_ASSERT_DBG(f)		RLV_ASSERT(f)
+#else
+    // Don't halt execution on errors in release
+    #define RLV_ERRS				LL_WARNS("RLV")
+    // We don't want to check assertions in release builds
+    #ifdef RLV_DEBUG
+        #define RLV_ASSERT(f)		RLV_VERIFY(f)
+        #define RLV_ASSERT_DBG(f)
+    #else
+        #define RLV_ASSERT(f)
+        #define RLV_ASSERT_DBG(f)
+    #endif // RLV_DEBUG
+#endif // LL_RELEASE_WITH_DEBUG_INFO || LL_DEBUG
+
+namespace Rlv
+{
+    // Version of the specification we report
+    namespace SpecVersion {
+        constexpr S32 Major = 4;
+        constexpr S32 Minor = 0;
+        constexpr S32 Patch = 0;
+        constexpr S32 Build = 0;
+    };
+
+    // RLVa implementation version
+    namespace ImplVersion {
+        constexpr S32 Major = 3;
+        constexpr S32 Minor = 0;
+        constexpr S32 Patch = 0;
+        constexpr S32 ImplId = 13;
+    };
+
+    namespace Constants
+    {
+        constexpr char CmdPrefix = '@';
+        constexpr char ConsolePrompt[] = "> ";
+        constexpr std::string_view OptionSeparator = ";";
+    }
+}
+
+// ============================================================================
+// Enumeration declarations
+//
+
+namespace Rlv
+{
+    enum class EBehaviour {
+        Version = 0,
+        VersionNew,
+        VersionNum,
+        GetCommand,
+
+        Count,
+        Unknown,
+    };
+
+    enum class EBehaviourOptionType
+    {
+        None,                               // Behaviour takes no parameters
+        Exception,                          // Behaviour requires an exception as a parameter
+        NoneOrException,                    // Behaviour takes either no parameters or an exception
+    };
+
+    enum class EParamType {
+        Unknown = 0x00,
+        Add     = 0x01,                 // <param> == "n"|"add"
+        Remove  = 0x02,                 // <param> == "y"|"rem"
+        Force   = 0x04,                 // <param> == "force"
+        Reply   = 0x08,                 // <param> == <number>
+        Clear   = 0x10,
+        AddRem  = Add | Remove
+    };
+
+    enum class ECmdRet {
+        Unknown = 0x0000,               // Unknown error (should only be used internally)
+        Retained,                       // Command was retained
+        Success = 0x0100,               // Command executed successfully
+        SuccessUnset,                   // Command executed successfully (RLV_TYPE_REMOVE for an unrestricted behaviour)
+        SuccessDuplicate,               // Command executed successfully (RLV_TYPE_ADD for an already restricted behaviour)
+        SuccessDeprecated,              // Command executed successfully but has been marked as deprecated
+        SuccessDelayed,                 // Command parsed valid but will execute at a later time
+        Failed = 0x0200,                // Command failed (general failure)
+        FailedSyntax,                   // Command failed (syntax error)
+        FailedOption,                   // Command failed (invalid option)
+        FailedParam,                    // Command failed (invalid param)
+        FailedLock,                     // Command failed (command is locked by another object)
+        FailedDisabled,                 // Command failed (command disabled by user)
+        FailedUnknown,                  // Command failed (unknown command)
+        FailedNoSharedRoot,             // Command failed (missing #RLV)
+        FailedDeprecated,               // Command failed (deprecated and no longer supported)
+        FailedNoBehaviour,              // Command failed (force modifier on an object with no active restrictions)
+        FailedUnheldBehaviour,          // Command failed (local modifier on an object that doesn't hold the base behaviour)
+        FailedBlocked,                  // Command failed (object is blocked)
+        FailedThrottled,                // Command failed (throttled)
+        FailedNoProcessor               // Command doesn't have a template processor define (legacy code)
+    };
+
+    enum class EExceptionCheck
+    {
+        Permissive,						// Exception can be set by any object
+        Strict,							// Exception must be set by all objects holding the restriction
+        Default,						// Permissive or strict will be determined by currently enforced restrictions
+    };
+
+    // Replace&remove in c++23
+    template <typename E>
+    constexpr std::enable_if_t<std::is_enum_v<E> && !std::is_convertible_v<E, int>, std::underlying_type_t<E>> to_underlying(E e) noexcept
+    {
+        return static_cast<std::underlying_type_t<E>>(e);
+    }
+
+    template <typename E>
+    constexpr std::enable_if_t<std::is_enum_v<E> && !std::is_convertible_v<E, int>, bool> has_flag(E value, E flag) noexcept
+    {
+        return (to_underlying(value) & to_underlying(flag)) != 0;
+    }
+
+    constexpr bool isReturnCodeSuccess(ECmdRet eRet)
+    {
+        return (to_underlying(eRet) & to_underlying(ECmdRet::Success)) == to_underlying(ECmdRet::Success);
+    }
+
+    constexpr bool isReturnCodeFailed(ECmdRet eRet)
+    {
+        return (to_underlying(eRet) & to_underlying(ECmdRet::Failed)) == to_underlying(ECmdRet::Failed);
+    }
+}
+
+// ============================================================================
+// Settings
+//
+
+namespace Rlv
+{
+    namespace Settings
+    {
+        constexpr char Main[] = "RestrainedLove";
+        constexpr char Debug[] = "RestrainedLoveDebug";
+
+        constexpr char DebugHideUnsetDup[] = "RLVaDebugHideUnsetDuplicate";
+        constexpr char EnableExperimentalCommands[] = "RLVaExperimentalCommands";
+        constexpr char EnableIMQuery[] = "RLVaEnableIMQuery";
+        constexpr char EnableTempAttach[] = "RLVaEnableTemporaryAttachments";
+        constexpr char TopLevelMenu[] = "RLVaTopLevelMenu";
+    };
+
+};
+
+// ============================================================================
diff --git a/indra/newview/rlvfloaters.cpp b/indra/newview/rlvfloaters.cpp
new file mode 100644
index 0000000000..8a074fd14d
--- /dev/null
+++ b/indra/newview/rlvfloaters.cpp
@@ -0,0 +1,122 @@
+/**
+ * @file rlvfloaters.cpp
+ * @author Kitty Barnett
+ * @brief RLVa floaters class implementations
+ *
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2024, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#include "llviewerprecompiledheaders.h"
+
+#include "llagentdata.h"
+#include "llchatentry.h"
+#include "lltexteditor.h"
+#include "lltrans.h"
+#include "llvoavatarself.h"
+
+#include "rlvfloaters.h"
+#include "rlvhandler.h"
+
+using namespace Rlv;
+
+// ============================================================================
+// FloaterConsole
+//
+
+bool FloaterConsole::postBuild()
+{
+    mInputEdit = getChild<LLChatEntry>("console_input");
+    mInputEdit->setCommitCallback(std::bind(&FloaterConsole::onInput, this));
+    mInputEdit->setTextExpandedCallback(std::bind(&FloaterConsole::reshapeLayoutPanel, this));
+    mInputEdit->setFocus(true);
+    mInputEdit->setCommitOnFocusLost(false);
+
+    mInputPanel = getChild<LLLayoutPanel>("input_panel");
+    mInputEditPad = mInputPanel->getRect().getHeight() - mInputEdit->getRect().getHeight();
+
+    mOutputText = getChild<LLTextEditor>("console_output");
+    mOutputText->appendText(Constants::ConsolePrompt, false);
+
+    if (RlvHandler::isEnabled())
+    {
+        mCommandOutputConn = RlvHandler::instance().setCommandOutputCallback([this](const RlvCommand& rlvCmd, S32, const std::string strText)
+        {
+            if (rlvCmd.getObjectID() == gAgentID)
+            {
+                mOutputText->appendText(rlvCmd.getBehaviour() + ": ", true);
+                mOutputText->appendText(strText, false);
+            }
+        });
+    }
+
+    return true;
+}
+
+void FloaterConsole::onClose(bool fQuitting)
+{
+    if (RlvHandler::isEnabled())
+    {
+        RlvHandler::instance().processCommand(gAgentID, "clear", true);
+    }
+}
+
+void FloaterConsole::onInput()
+{
+    if (!isAgentAvatarValid())
+    {
+        return;
+    }
+
+    std::string strText = mInputEdit->getText();
+    LLStringUtil::trim(strText);
+
+    mOutputText->appendText(strText, false);
+    mInputEdit->setText(LLStringUtil::null);
+
+    if (!RlvHandler::isEnabled())
+    {
+        mOutputText->appendText(LLTrans::getString("RlvConsoleDisable"), true);
+    }
+    else if (strText.length() <= 3 || Constants::CmdPrefix != strText[0])
+    {
+        mOutputText->appendText(LLTrans::getString("RlvConsoleInvalidCmd"), true);
+    }
+    else
+    {
+        LLChat chat;
+        chat.mFromID = gAgentID;
+        chat.mChatType = CHAT_TYPE_OWNER;
+
+        RlvHandler::instance().handleSimulatorChat(strText, chat, gAgentAvatarp);
+
+        mOutputText->appendText(strText, true);
+    }
+
+    mOutputText->appendText(Constants::ConsolePrompt, true);
+}
+
+void FloaterConsole::reshapeLayoutPanel()
+{
+    mInputPanel->reshape(mInputPanel->getRect().getWidth(), mInputEdit->getRect().getHeight() + mInputEditPad, false);
+}
+
+// ============================================================================
diff --git a/indra/newview/rlvfloaters.h b/indra/newview/rlvfloaters.h
new file mode 100644
index 0000000000..1d560f32d4
--- /dev/null
+++ b/indra/newview/rlvfloaters.h
@@ -0,0 +1,67 @@
+/**
+ * @file rlvfloaters.h
+ * @author Kitty Barnett
+ * @brief RLVa floaters class implementations
+ *
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2024, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#pragma once
+
+#include "llfloater.h"
+
+#include "rlvdefines.h"
+
+class LLChatEntry;
+class LLLayoutPanel;
+class LLTextEditor;
+class RlvCommand;
+class RlvHandler;
+
+namespace Rlv
+{
+    // ============================================================================
+    // FloaterConsole - debug console to allow command execution without the need for a script
+    //
+
+    class FloaterConsole : public LLFloater
+    {
+        friend class LLFloaterReg;
+        FloaterConsole(const LLSD& sdKey) : LLFloater(sdKey) {}
+
+    public:
+        bool postBuild() override;
+        void onClose(bool fQuitting) override;
+    protected:
+        void onInput();
+        void reshapeLayoutPanel();
+
+    private:
+        boost::signals2::scoped_connection mCommandOutputConn;
+        int mInputEditPad = 0;
+        LLLayoutPanel* mInputPanel = nullptr;
+        LLChatEntry* mInputEdit = nullptr;
+        LLTextEditor* mOutputText = nullptr;
+    };
+
+    // ============================================================================
+};
diff --git a/indra/newview/rlvhandler.cpp b/indra/newview/rlvhandler.cpp
new file mode 100644
index 0000000000..bf086c1b4b
--- /dev/null
+++ b/indra/newview/rlvhandler.cpp
@@ -0,0 +1,225 @@
+/**
+ * @file rlvhandler.cpp
+ * @author Kitty Barnett
+ * @brief RLVa helper classes for internal use only
+ *
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2024, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#include "llviewerprecompiledheaders.h"
+#include "llagent.h"
+#include "llstartup.h"
+#include "llviewercontrol.h"
+#include "llviewerobject.h"
+
+#include "rlvcommon.h"
+#include "rlvhandler.h"
+#include "rlvhelper.h"
+
+#include <boost/algorithm/string.hpp>
+
+using namespace Rlv;
+
+// ============================================================================
+// Static variable initialization
+//
+
+bool RlvHandler::mIsEnabled = false;
+
+// ============================================================================
+// Command processing functions
+//
+
+bool RlvHandler::handleSimulatorChat(std::string& message, const LLChat& chat, const LLViewerObject* chatObj)
+{
+    // *TODO: There's an edge case for temporary attachments when going from enabled -> disabled with restrictions already in place
+    static LLCachedControl<bool> enable_temp_attach(gSavedSettings, Settings::EnableTempAttach);
+    static LLCachedControl<bool> show_debug_output(gSavedSettings, Settings::Debug);
+    static LLCachedControl<bool> hide_unset_dupes(gSavedSettings, Settings::DebugHideUnsetDup);
+
+    if ( message.length() <= 3 || Constants::CmdPrefix != message[0] || CHAT_TYPE_OWNER != chat.mChatType ||
+         (chatObj && chatObj->isTempAttachment() && !enable_temp_attach()) )
+    {
+        return false;
+    }
+
+    message.erase(0, 1);
+    LLStringUtil::toLower(message);
+    CommandDbgOut cmdDbgOut(message, chatObj->getID() == gAgentID);
+
+    boost_tokenizer tokens(message, boost::char_separator<char>(",", "", boost::drop_empty_tokens));
+    for (const std::string& strCmd : tokens)
+    {
+        ECmdRet eRet = processCommand(chat.mFromID, strCmd, true);
+        if ( show_debug_output() &&
+             (!hide_unset_dupes() || (ECmdRet::SuccessUnset != eRet && ECmdRet::SuccessDuplicate != eRet)) )
+        {
+            cmdDbgOut.add(strCmd, eRet);
+        }
+    }
+
+    message = cmdDbgOut.get();
+    return true;
+}
+
+ECmdRet RlvHandler::processCommand(const LLUUID& idObj, const std::string& strCmd, bool fromObj)
+{
+    const RlvCommand rlvCmd(idObj, strCmd);
+    return processCommand(std::ref(rlvCmd), fromObj);
+}
+
+ECmdRet RlvHandler::processCommand(std::reference_wrapper<const RlvCommand> rlvCmd, bool fromObj)
+{
+    {
+        const RlvCommand& rlvCmdTmp = rlvCmd; // Reference to the temporary with limited variable scope since we don't want it to leak below
+
+        RLV_DEBUGS << "[" << rlvCmdTmp.getObjectID() << "]: " << rlvCmdTmp.asString() << RLV_ENDL;
+        if (!rlvCmdTmp.isValid())
+        {
+            RLV_DEBUGS << "\t-> invalid syntax" << RLV_ENDL;
+            return ECmdRet::FailedSyntax;
+        }
+        if (rlvCmdTmp.isBlocked())
+        {
+            RLV_DEBUGS << "\t-> blocked command" << RLV_ENDL;
+            return ECmdRet::FailedDisabled;
+        }
+    }
+
+    ECmdRet eRet = ECmdRet::Unknown;
+    switch (rlvCmd.get().getParamType())
+    {
+        case EParamType::Reply:
+            eRet = rlvCmd.get().processCommand();
+            break;
+        case EParamType::Unknown:
+        default:
+            eRet = ECmdRet::FailedParam;
+            break;
+    }
+    RLV_ASSERT(ECmdRet::Unknown != eRet);
+
+    RLV_DEBUGS << "\t--> command " << (isReturnCodeSuccess(eRet) ? "succeeded" : "failed") << RLV_ENDL;
+
+    return eRet;
+}
+
+// ============================================================================
+// Initialization helper functions
+//
+
+bool RlvHandler::canEnable()
+{
+    return LLStartUp::getStartupState() <= STATE_LOGIN_CLEANUP;
+}
+
+bool RlvHandler::setEnabled(bool enable)
+{
+    if (mIsEnabled == enable)
+        return enable;
+
+    if (enable && canEnable())
+    {
+        RLV_INFOS << "Enabling Restrained Love API support - " << Strings::getVersionAbout() << RLV_ENDL;
+        mIsEnabled = true;
+    }
+
+    return mIsEnabled;
+}
+
+// ============================================================================
+// Command handlers (RLV_TYPE_REPLY)
+//
+
+ECmdRet CommandHandlerBaseImpl<EParamType::Reply>::processCommand(const RlvCommand& rlvCmd, ReplyHandlerFunc* pHandler)
+{
+    // Sanity check - <param> should specify a - valid - reply channel
+    S32 nChannel;
+    if (!LLStringUtil::convertToS32(rlvCmd.getParam(), nChannel) || !Util::isValidReplyChannel(nChannel, rlvCmd.getObjectID() == gAgentID))
+        return ECmdRet::FailedParam;
+
+    std::string strReply;
+    ECmdRet eRet = (*pHandler)(rlvCmd, strReply);
+
+    // If we made it this far then:
+    //   - the command was handled successfully so we send off the response
+    //   - the command failed but we still send off an - empty - response to keep the issuing script from blocking
+    if (nChannel != 0)
+    {
+        Util::sendChatReply(nChannel, strReply);
+    }
+    RlvHandler::instance().mOnCommandOutput(rlvCmd, nChannel, strReply);
+
+    return eRet;
+}
+
+// Handles: @getcommand[:<behaviour>[;<type>[;<separator>]]]=<channel>
+template<> template<>
+ECmdRet ReplyHandler<EBehaviour::GetCommand>::onCommand(const RlvCommand& rlvCmd, std::string& strReply)
+{
+    std::vector<std::string> optionList;
+    Util::parseStringList(rlvCmd.getOption(), optionList);
+
+    // If a second parameter is present it'll specify the command type
+    EParamType eType = EParamType::Unknown;
+    if (optionList.size() >= 2)
+    {
+        if (optionList[1] == "any" || optionList[1].empty())
+            eType = EParamType::Unknown;
+        else if (optionList[1] == "add")
+            eType = EParamType::AddRem;
+        else if (optionList[1] == "force")
+            eType = EParamType::Force;
+        else if (optionList[1] == "reply")
+            eType = EParamType::Reply;
+        else
+            return ECmdRet::FailedOption;
+    }
+
+    std::list<std::string> cmdList;
+    if (BehaviourDictionary::instance().getCommands(!optionList.empty() ? optionList[0] : LLStringUtil::null, eType, cmdList))
+        strReply = boost::algorithm::join(cmdList, optionList.size() >= 3 ? optionList[2] : Constants::OptionSeparator);
+    return ECmdRet::Success;
+}
+
+// Handles: @version=<chnannel> and @versionnew=<channel>
+template<> template<>
+ECmdRet VersionReplyHandler::onCommand(const RlvCommand& rlvCmd, std::string& strReply)
+{
+    strReply = Strings::getVersion(EBehaviour::Version == rlvCmd.getBehaviourType());
+    return ECmdRet::Success;
+}
+
+// Handles: @versionnum[:impl]=<channel>
+template<> template<>
+ECmdRet ReplyHandler<EBehaviour::VersionNum>::onCommand(const RlvCommand& rlvCmd, std::string& strReply)
+{
+    if (!rlvCmd.hasOption())
+        strReply = Strings::getVersionNum();
+    else if ("impl" == rlvCmd.getOption())
+        strReply = Strings::getVersionImplNum();
+    else
+        return ECmdRet::FailedOption;
+    return ECmdRet::Success;
+}
+
+// ============================================================================
diff --git a/indra/newview/rlvhandler.h b/indra/newview/rlvhandler.h
new file mode 100644
index 0000000000..38612485b1
--- /dev/null
+++ b/indra/newview/rlvhandler.h
@@ -0,0 +1,80 @@
+/**
+ * @file rlvhandler.h
+ * @author Kitty Barnett
+ * @brief Primary command process and orchestration class
+ *
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2024, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#pragma once
+
+#include "llchat.h"
+#include "llsingleton.h"
+
+#include "rlvhelper.h"
+
+class LLViewerObject;
+
+// ============================================================================
+// RlvHandler class
+//
+
+class RlvHandler : public LLSingleton<RlvHandler>
+{
+    template<Rlv::EParamType> friend struct Rlv::CommandHandlerBaseImpl;
+
+    LLSINGLETON_EMPTY_CTOR(RlvHandler);
+
+    /*
+     * Command processing
+     */
+public:
+    // Command processing helper functions
+    bool         handleSimulatorChat(std::string& message, const LLChat& chat, const LLViewerObject* chatObj);
+    Rlv::ECmdRet processCommand(const LLUUID& idObj, const std::string& stCmd, bool fromObj);
+protected:
+    Rlv::ECmdRet processCommand(std::reference_wrapper<const RlvCommand> rlvCmdRef, bool fromObj);
+
+    /*
+     * Helper functions
+     */
+public:
+    // Initialization (deliberately static so they can safely be called in tight loops)
+    static bool canEnable();
+    static bool isEnabled() { return mIsEnabled; }
+    static bool setEnabled(bool enable);
+
+    /*
+     * Event handling
+     */
+public:
+    // The command output signal is triggered whenever a command produces channel or debug output
+    using command_output_signal_t = boost::signals2::signal<void (const RlvCommand&, S32, const std::string&)>;
+    boost::signals2::connection setCommandOutputCallback(const command_output_signal_t::slot_type& cb) { return mOnCommandOutput.connect(cb); }
+
+protected:
+    command_output_signal_t mOnCommandOutput;
+private:
+    static bool mIsEnabled;
+};
+
+// ============================================================================
diff --git a/indra/newview/rlvhelper.cpp b/indra/newview/rlvhelper.cpp
new file mode 100644
index 0000000000..a82de4b9b8
--- /dev/null
+++ b/indra/newview/rlvhelper.cpp
@@ -0,0 +1,389 @@
+/**
+ * @file rlvhelper.cpp
+ * @author Kitty Barnett
+ * @brief RLVa helper classes for internal use only
+ *
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2024, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#include "llviewerprecompiledheaders.h"
+
+#include "lltrans.h"
+#include "llviewercontrol.h"
+
+#include "rlvhelper.h"
+
+#include <boost/algorithm/string.hpp>
+
+using namespace Rlv;
+
+// ============================================================================
+// BehaviourDictionary
+//
+
+BehaviourDictionary::BehaviourDictionary()
+{
+    //
+    // Restrictions
+    //
+
+    //
+    // Reply-only
+    //
+    addEntry(new ReplyProcessor<EBehaviour::GetCommand>("getcommand"));
+    addEntry(new ReplyProcessor<EBehaviour::Version, VersionReplyHandler>("version"));
+    addEntry(new ReplyProcessor<EBehaviour::VersionNew, VersionReplyHandler>("versionnew"));
+    addEntry(new ReplyProcessor<EBehaviour::VersionNum>("versionnum"));
+
+    // Populate mString2InfoMap (the tuple <behaviour, type> should be unique)
+    for (const BehaviourInfo* bhvr_info_p : mBhvrInfoList)
+    {
+        RLV_VERIFY(mString2InfoMap.insert(std::make_pair(std::make_pair(bhvr_info_p->getBehaviour(), static_cast<EParamType>(bhvr_info_p->getParamTypeMask())), bhvr_info_p)).second);
+    }
+
+    // Populate m_Bhvr2InfoMap (there can be multiple entries per ERlvBehaviour)
+    for (const BehaviourInfo* bhvr_info_p : mBhvrInfoList)
+    {
+        if ((bhvr_info_p->getParamTypeMask() & to_underlying(EParamType::AddRem)) && !bhvr_info_p->isSynonym())
+        {
+#ifdef RLV_DEBUG
+            for (const auto& itBhvr : boost::make_iterator_range(mBhvr2InfoMap.lower_bound(bhvr_info_p->getBehaviourType()), mBhvr2InfoMap.upper_bound(bhvr_info_p->getBehaviourType())))
+            {
+                RLV_ASSERT((itBhvr.first != bhvr_info_p->getBehaviourType()) || (itBhvr.second->getBehaviourFlags() != bhvr_info_p->getBehaviourFlags()));
+            }
+#endif // RLV_DEBUG
+            mBhvr2InfoMap.insert(std::pair(bhvr_info_p->getBehaviourType(), bhvr_info_p));
+        }
+    }
+}
+
+BehaviourDictionary::~BehaviourDictionary()
+{
+    for (const BehaviourInfo* bhvr_info_p : mBhvrInfoList)
+    {
+        delete bhvr_info_p;
+    }
+    mBhvrInfoList.clear();
+}
+
+void BehaviourDictionary::addEntry(const BehaviourInfo* entry_p)
+{
+    // Filter experimental commands (if disabled)
+    static LLCachedControl<bool> sEnableExperimental(gSavedSettings, Settings::EnableExperimentalCommands);
+    if (!entry_p || (!sEnableExperimental && entry_p->isExperimental()))
+    {
+        return;
+    }
+
+    // Sanity check for duplicate entries
+#ifndef LL_RELEASE_FOR_DOWNLOAD
+    std::for_each(mBhvrInfoList.begin(), mBhvrInfoList.end(),
+        [&entry_p](const BehaviourInfo* bhvr_info_p) {
+            RLV_ASSERT_DBG((bhvr_info_p->getBehaviour() != entry_p->getBehaviour()) || ((bhvr_info_p->getParamTypeMask() & entry_p->getParamTypeMask()) == 0));
+        });
+#endif // LL_RELEASE_FOR_DOWNLOAD
+
+    mBhvrInfoList.push_back(entry_p);
+}
+
+const BehaviourInfo* BehaviourDictionary::getBehaviourInfo(EBehaviour eBhvr, EParamType eParamType) const
+{
+    const BehaviourInfo* bhvr_info_p = nullptr;
+    for (auto itBhvrLower = mBhvr2InfoMap.lower_bound(eBhvr), itBhvrUpper = mBhvr2InfoMap.upper_bound(eBhvr);
+        std::find_if(itBhvrLower, itBhvrUpper, [eParamType](const auto& bhvrEntry) { return bhvrEntry.second->getParamTypeMask() == to_underlying(eParamType); }) != itBhvrUpper;
+        ++itBhvrLower)
+    {
+        if (bhvr_info_p)
+            return nullptr;
+        bhvr_info_p = itBhvrLower->second;
+    }
+    return bhvr_info_p;
+}
+
+const BehaviourInfo* BehaviourDictionary::getBehaviourInfo(const std::string& strBhvr, EParamType eParamType, bool* is_strict_p) const
+{
+    size_t idxBhvrLastPart = strBhvr.find_last_of('_');
+    std::string strBhvrLastPart((std::string::npos != idxBhvrLastPart) && (idxBhvrLastPart < strBhvr.size()) ? strBhvr.substr(idxBhvrLastPart + 1) : LLStringUtil::null);
+
+    bool isStrict = (strBhvrLastPart.compare("sec") == 0);
+    if (is_strict_p)
+        *is_strict_p = isStrict;
+
+    auto itBhvr = mString2InfoMap.find(std::make_pair((!isStrict) ? strBhvr : strBhvr.substr(0, strBhvr.size() - 4), (has_flag(eParamType, EParamType::AddRem)) ? EParamType::AddRem : eParamType));
+    if ((mString2InfoMap.end() == itBhvr) && (!isStrict) && (!strBhvrLastPart.empty()) && (EParamType::Force == eParamType))
+    {
+        // No match found but it could still be a local scope modifier
+        auto itBhvrMod = mString2InfoMap.find(std::make_pair(strBhvr.substr(0, idxBhvrLastPart), EParamType::AddRem));
+    }
+
+    return ((itBhvr != mString2InfoMap.end()) && ((!isStrict) || (itBhvr->second->hasStrict()))) ? itBhvr->second : nullptr;
+}
+
+EBehaviour BehaviourDictionary::getBehaviourFromString(const std::string& strBhvr, EParamType eParamType, bool* pisStrict) const
+{
+    const BehaviourInfo* bhvr_info_p = getBehaviourInfo(strBhvr, eParamType, pisStrict);
+    // Filter out locally scoped modifier commands since they don't actually have a unique behaviour value of their own
+    return bhvr_info_p->getBehaviourType();
+}
+
+bool BehaviourDictionary::getCommands(const std::string& strMatch, EParamType eParamType, std::list<std::string>& cmdList) const
+{
+    cmdList.clear();
+    for (const BehaviourInfo* bhvr_info_p : mBhvrInfoList)
+    {
+        if ((bhvr_info_p->getParamTypeMask() & to_underlying(eParamType)) || (EParamType::Unknown == eParamType))
+        {
+            std::string strCmd = bhvr_info_p->getBehaviour();
+            if ((std::string::npos != strCmd.find(strMatch)) || (strMatch.empty()))
+                cmdList.push_back(strCmd);
+            if ((bhvr_info_p->hasStrict()) && ((std::string::npos != strCmd.append("_sec").find(strMatch)) || (strMatch.empty())))
+                cmdList.push_back(strCmd);
+        }
+    }
+    return !cmdList.empty();
+}
+
+bool BehaviourDictionary::getHasStrict(EBehaviour eBhvr) const
+{
+    for (const auto& itBhvr : boost::make_iterator_range(mBhvr2InfoMap.lower_bound(eBhvr), mBhvr2InfoMap.upper_bound(eBhvr)))
+    {
+        // Only restrictions can be strict
+        if (to_underlying(EParamType::AddRem) != itBhvr.second->getParamTypeMask())
+            continue;
+        return itBhvr.second->hasStrict();
+    }
+    RLV_ASSERT(false);
+    return false;
+}
+
+void BehaviourDictionary::toggleBehaviourFlag(const std::string& strBhvr, EParamType eParamType, BehaviourInfo::EBehaviourFlags eBhvrFlag, bool fEnable)
+{
+    auto itBhvr = mString2InfoMap.find(std::make_pair(strBhvr, (has_flag(eParamType, EParamType::AddRem)) ? EParamType::AddRem : eParamType));
+    if (mString2InfoMap.end() != itBhvr)
+    {
+        const_cast<BehaviourInfo*>(itBhvr->second)->toggleBehaviourFlag(eBhvrFlag, fEnable);
+    }
+}
+
+// ============================================================================
+// RlvCommmand
+//
+
+RlvCommand::RlvCommand(const LLUUID& idObj, const std::string& strCmd)
+    : mObjId(idObj)
+{
+    if (parseCommand(strCmd, mBehaviour, mOption, mParam))
+    {
+         if ("n" == mParam || "add" == mParam)
+             mParamType = EParamType::Add;
+         else if ("y" == mParam || "rem" == mParam)
+             mParamType = EParamType::Remove;
+         else if ("clear" == mBehaviour)                                     // clear is the odd one out so just make it its own type
+             mParamType = EParamType::Clear;
+         else if ("force" == mParam)
+             mParamType = EParamType::Force;
+         else if (S32 nTemp; LLStringUtil::convertToS32(mParam, nTemp))  // Assume it's a reply command if we can convert <param> to an S32
+            mParamType = EParamType::Reply;
+    }
+
+    mIsValid = mParamType != EParamType::Unknown;
+    if (!mIsValid)
+    {
+        mOption.clear();
+        mParam.clear();
+        return;
+    }
+
+    mBhvrInfo = BehaviourDictionary::instance().getBehaviourInfo(mBehaviour, mParamType, &mIsStrict);
+}
+
+RlvCommand::RlvCommand(const RlvCommand& rlvCmd, EParamType eParamType)
+    : mIsValid(rlvCmd.mIsValid), mObjId(rlvCmd.mObjId), mBehaviour(rlvCmd.mBehaviour), mBhvrInfo(rlvCmd.mBhvrInfo)
+    , mParamType( (EParamType::Unknown == eParamType) ? rlvCmd.mParamType : eParamType)
+    , mIsStrict(rlvCmd.mIsStrict), mOption(rlvCmd.mOption), mParam(rlvCmd.mParam), mIsRefCounted(rlvCmd.mIsRefCounted)
+{
+}
+
+bool RlvCommand::parseCommand(const std::string& strCmd, std::string& strBhvr, std::string& strOption, std::string& strParam)
+{
+    // Format: <behaviour>[:<option>]=<param>
+    const size_t idxOption = strCmd.find(':');
+    const size_t idxParam  = strCmd.find('=');
+
+    // If <behaviour> is missing it's always an improperly formatted command
+    // If there's an option, but it comes after <param> it's also invalid
+    if ( (idxOption == 0 || idxParam == 0) ||
+         (idxOption != std::string::npos && idxOption >= idxParam) )
+    {
+        return false;
+    }
+
+    strBhvr = strCmd.substr(0, std::string::npos != idxOption ? idxOption : idxParam);
+    strOption = strParam = "";
+
+    // If <param> is missing it's an improperly formatted command
+    if (idxParam == std::string::npos || idxParam + 1 == strCmd.length())
+    {
+        // Unless "<behaviour> == "clear" AND (idxOption == 0)"
+        // OR <behaviour> == "clear" AND (idxParam != 0)
+        if (strBhvr == "clear" && (!idxOption || idxParam))
+            return true;
+        return false;
+    }
+
+    if (idxOption != std::string::npos && idxOption + 1 != idxParam)
+        strOption = strCmd.substr(idxOption + 1, idxParam - idxOption - 1);
+    strParam = strCmd.substr(idxParam + 1);
+
+    return true;
+}
+
+std::string RlvCommand::asString() const
+{
+    // NOTE: @clear=<param> should be represented as clear:<param>
+    return mParamType != EParamType::Clear
+        ? getBehaviour() + (!mOption.empty() ? ":" + mOption : "")
+        : getBehaviour() + (!mParam.empty() ? ":" + mParam : "");
+}
+
+// =========================================================================
+// Various helper classes/timers/functors
+//
+
+namespace Rlv
+{
+    // ===========================================================================
+    // CommandDbgOut
+    //
+
+    void CommandDbgOut::add(std::string strCmd, ECmdRet eRet)
+    {
+        const std::string strSuffix = getReturnCodeString(eRet);
+        if (!strSuffix.empty())
+            strCmd.append(llformat(" (%s)", strSuffix.c_str()));
+        else if (mForConsole)
+            return; // Only show console feedback on successful commands when there's an informational notice
+
+        std::string& strResult = mCommandResults[isReturnCodeSuccess(eRet) ? ECmdRet::Success : (ECmdRet::Retained == eRet ? ECmdRet::Retained : ECmdRet::Failed)];
+        if (!strResult.empty())
+            strResult.append(", ");
+        strResult.append(strCmd);
+    }
+
+    std::string CommandDbgOut::get() const {
+        std::ostringstream result;
+
+        if (1 == mCommandResults.size() && !mForConsole)
+        {
+            auto it = mCommandResults.begin();
+            result << " " << getDebugVerbFromReturnCode(it->first) << ": @" << it->second;
+        }
+        else if (!mCommandResults.empty())
+        {
+            auto appendResult = [&](ECmdRet eRet, const std::string& name)
+                {
+                    auto it = mCommandResults.find(eRet);
+                    if (it == mCommandResults.end()) return;
+                    if (!mForConsole) result << "\n    - ";
+                    result << LLTrans::getString(name) << ": @" << it->second;
+                };
+            if (!mForConsole)
+                result << ": @" << mOrigCmd;
+            appendResult(ECmdRet::Success, !mForConsole ? "RlvDebugExecuted" : "RlvConsoleExecuted");
+            appendResult(ECmdRet::Failed, !mForConsole ? "RlvDebugFailed" : "RlvConsoleFailed");
+            appendResult(ECmdRet::Retained, !mForConsole ? "RlvDebugRetained" : "RlvConsoleRetained");
+        }
+
+        return result.str();
+    }
+
+    std::string CommandDbgOut::getDebugVerbFromReturnCode(ECmdRet eRet)
+    {
+        switch (eRet)
+        {
+            case ECmdRet::Success:
+                return LLTrans::getString("RlvDebugExecuted");
+            case ECmdRet::Failed:
+                return LLTrans::getString("RlvDebugFailed");
+            case ECmdRet::Retained:
+                return LLTrans::getString("RlvDebugRetained");
+            default:
+                RLV_ASSERT(false);
+                return LLStringUtil::null;
+        }
+    }
+
+    std::string CommandDbgOut::getReturnCodeString(ECmdRet eRet)
+    {
+        switch (eRet)
+        {
+            case ECmdRet::SuccessUnset:
+                return LLTrans::getString("RlvReturnCodeUnset");
+            case ECmdRet::SuccessDuplicate:
+                return LLTrans::getString("RlvReturnCodeDuplicate");
+            case ECmdRet::SuccessDelayed:
+                return LLTrans::getString("RlvReturnCodeDelayed");
+            case ECmdRet::SuccessDeprecated:
+                return LLTrans::getString("RlvReturnCodeDeprecated");
+            case ECmdRet::FailedSyntax:
+                return LLTrans::getString("RlvReturnCodeSyntax");
+            case ECmdRet::FailedOption:
+                return LLTrans::getString("RlvReturnCodeOption");
+            case ECmdRet::FailedParam:
+                return LLTrans::getString("RlvReturnCodeParam");
+            case ECmdRet::FailedLock:
+                return LLTrans::getString("RlvReturnCodeLock");
+            case ECmdRet::FailedDisabled:
+                return LLTrans::getString("RlvReturnCodeDisabled");
+            case ECmdRet::FailedUnknown:
+                return LLTrans::getString("RlvReturnCodeUnknown");
+            case ECmdRet::FailedNoSharedRoot:
+                return LLTrans::getString("RlvReturnCodeNoSharedRoot");
+            case ECmdRet::FailedDeprecated:
+                return LLTrans::getString("RlvReturnCodeDeprecatedAndDisabled");
+            case ECmdRet::FailedNoBehaviour:
+                return LLTrans::getString("RlvReturnCodeNoBehaviour");
+            case ECmdRet::FailedUnheldBehaviour:
+                return LLTrans::getString("RlvReturnCodeUnheldBehaviour");
+            case ECmdRet::FailedBlocked:
+                return LLTrans::getString("RlvReturnCodeBlocked");
+            case ECmdRet::FailedThrottled:
+                return LLTrans::getString("RlvReturnCodeThrottled");
+            case ECmdRet::FailedNoProcessor:
+                return LLTrans::getString("RlvReturnCodeNoProcessor");
+            // The following are identified by the chat verb
+            case ECmdRet::Retained:
+            case ECmdRet::Success:
+            case ECmdRet::Failed:
+                return LLStringUtil::null;
+            // The following shouldn't occur
+            case ECmdRet::Unknown:
+            default:
+                RLV_ASSERT(false);
+                return LLStringUtil::null;
+        }
+    }
+
+    // ===========================================================================
+}
+
+// ============================================================================
diff --git a/indra/newview/rlvhelper.h b/indra/newview/rlvhelper.h
new file mode 100644
index 0000000000..7f0435f791
--- /dev/null
+++ b/indra/newview/rlvhelper.h
@@ -0,0 +1,293 @@
+/**
+ * @file rlvhelper.h
+ * @author Kitty Barnett
+ * @brief RLVa helper classes for internal use only
+ *
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2024, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#pragma once
+
+#include "rlvdefines.h"
+
+// ============================================================================
+// Forward declarations
+//
+
+class RlvCommand;
+
+// ============================================================================
+
+namespace Rlv
+{
+    // ============================================================================
+    // BehaviourInfo class - Generic behaviour descriptor (used by restrictions, reply and force commands)
+    //
+
+    class BehaviourInfo
+    {
+    public:
+        enum EBehaviourFlags : uint32_t
+        {
+            // General behaviour flags
+            Strict = 0x0001,				// Behaviour has a "_sec" version
+            Synonym = 0x0002,				// Behaviour is a synonym of another
+            Extended = 0x0004,				// Behaviour is part of the RLVa extended command set
+            Experimental = 0x0008,			// Behaviour is part of the RLVa experimental command set
+            Blocked = 0x0010,				// Behaviour is blocked
+            Deprecated = 0x0020,			// Behaviour is deprecated
+            MaskGeneral = 0x0FFF,
+
+            // Force-wear specific flags
+            ForceWear_WearReplace = 0x0001 << 16,
+            ForceWear_WearAdd = 0x0002 << 16,
+            ForceWear_WearRemove = 0x0004 << 16,
+            ForceWear_Node = 0x0010 << 16,
+            ForceWear_Subtree = 0x0020 << 16,
+            ForceWear_ContextNone = 0x0100 << 16,
+            ForceWear_ContextObject = 0x0200 << 16,
+            MaskForceWear = 0xFFFFu << 16
+        };
+
+        BehaviourInfo(const std::string& strBhvr, EBehaviour eBhvr, EParamType maskParamType, std::underlying_type_t<EBehaviourFlags> nBhvrFlags = 0)
+            : mBhvr(strBhvr), mBhvrType(eBhvr), mBhvrFlags(nBhvrFlags), mMaskParamType(to_underlying(maskParamType)) {}
+        virtual ~BehaviourInfo() {}
+
+        const std::string&    getBehaviour() const { return mBhvr; }
+        EBehaviour            getBehaviourType() const { return mBhvrType; }
+        std::underlying_type_t<EBehaviourFlags> getBehaviourFlags() const { return mBhvrFlags; }
+        std::underlying_type_t<EParamType> getParamTypeMask() const { return mMaskParamType; }
+        bool                  hasStrict() const { return mBhvrFlags & Strict; }
+        bool                  isBlocked() const { return mBhvrFlags & Blocked; }
+        bool                  isExperimental() const { return mBhvrFlags & Experimental; }
+        bool                  isExtended() const { return mBhvrFlags & Extended; }
+        bool                  isSynonym() const { return mBhvrFlags & Synonym; }
+        void                  toggleBehaviourFlag(EBehaviourFlags eBhvrFlag, bool fEnable);
+
+        virtual ECmdRet  processCommand(const RlvCommand& rlvCmd) const { return ECmdRet::FailedNoProcessor; }
+
+    protected:
+        std::string mBhvr;
+        EBehaviour mBhvrType;
+        std::underlying_type_t<EBehaviourFlags> mBhvrFlags;
+        std::underlying_type_t<EParamType> mMaskParamType;
+    };
+
+    inline void BehaviourInfo::toggleBehaviourFlag(EBehaviourFlags eBhvrFlag, bool fEnable)
+    {
+        if (fEnable)
+            mBhvrFlags |= eBhvrFlag;
+        else
+            mBhvrFlags &= ~eBhvrFlag;
+    }
+
+    // ============================================================================
+    // BehaviourDictionary and related classes
+    //
+
+    class BehaviourDictionary : public LLSingleton<BehaviourDictionary>
+    {
+        LLSINGLETON(BehaviourDictionary);
+    protected:
+        ~BehaviourDictionary() override;
+    public:
+        void addEntry(const BehaviourInfo* entry_p);
+
+        /*
+         * General helper functions
+         */
+    public:
+        EBehaviour           getBehaviourFromString(const std::string& strBhvr, EParamType eParamType, bool* is_strict_p = nullptr) const;
+        const BehaviourInfo* getBehaviourInfo(EBehaviour eBhvr, EParamType eParamType) const;
+        const BehaviourInfo* getBehaviourInfo(const std::string& strBhvr, EParamType eParamType, bool* is_strict_p = nullptr) const;
+        bool                 getCommands(const std::string& strMatch, EParamType eParamType, std::list<std::string>& cmdList) const;
+        bool                 getHasStrict(EBehaviour eBhvr) const;
+        void                 toggleBehaviourFlag(const std::string& strBhvr, EParamType eParamType, BehaviourInfo::EBehaviourFlags eBvhrFlag, bool fEnable);
+
+        /*
+         * Member variables
+         */
+    protected:
+        std::list<const BehaviourInfo*> mBhvrInfoList;
+        std::map<std::pair<std::string, EParamType>, const BehaviourInfo*> mString2InfoMap;
+        std::multimap<EBehaviour, const BehaviourInfo*> mBhvr2InfoMap;
+    };
+
+    // ============================================================================
+    // CommandHandler and related classes
+    //
+
+    typedef ECmdRet(BhvrHandlerFunc)(const RlvCommand&, bool&);
+    typedef void(BhvrToggleHandlerFunc)(EBehaviour, bool);
+    typedef ECmdRet(ForceHandlerFunc)(const RlvCommand&);
+    typedef ECmdRet(ReplyHandlerFunc)(const RlvCommand&, std::string&);
+
+    //
+    // CommandHandlerBaseImpl - Base implementation for each command type (the old process(AddRem|Force|Reply)Command functions)
+    //
+    template<EParamType paramType> struct CommandHandlerBaseImpl;
+    template<> struct CommandHandlerBaseImpl<EParamType::AddRem> { static ECmdRet processCommand(const RlvCommand&, BhvrHandlerFunc*, BhvrToggleHandlerFunc* = nullptr); };
+    template<> struct CommandHandlerBaseImpl<EParamType::Force>  { static ECmdRet processCommand(const RlvCommand&, ForceHandlerFunc*); };
+    template<> struct CommandHandlerBaseImpl<EParamType::Reply>  { static ECmdRet processCommand(const RlvCommand&, ReplyHandlerFunc*); };
+
+    //
+    // CommandHandler - The actual command handler (Note that a handler is more general than a processor; a handler can - for instance - be used by multiple processors)
+    //
+
+    template <EParamType templParamType, EBehaviour templBhvr>
+    struct CommandHandler
+    {
+        template<typename = typename std::enable_if<templParamType == EParamType::AddRem>::type> static ECmdRet onCommand(const RlvCommand&, bool&);
+        template<typename = typename std::enable_if<templParamType == EParamType::AddRem>::type> static void onCommandToggle(EBehaviour, bool);
+        template<typename = typename std::enable_if<templParamType == EParamType::Force>::type>  static ECmdRet onCommand(const RlvCommand&);
+        template<typename = typename std::enable_if<templParamType == EParamType::Reply>::type>  static ECmdRet onCommand(const RlvCommand&, std::string&);
+    };
+
+    // Aliases to improve readability in definitions
+    template<EBehaviour templBhvr> using BehaviourHandler = CommandHandler<EParamType::AddRem, templBhvr>;
+    template<EBehaviour templBhvr> using BehaviourToggleHandler = BehaviourHandler<templBhvr>;
+    template<EBehaviour templBhvr> using ForceHandler = CommandHandler<EParamType::Force, templBhvr>;
+    template<EBehaviour templBhvr> using ReplyHandler = CommandHandler<EParamType::Reply, templBhvr>;
+
+    // List of shared handlers
+    using VersionReplyHandler = ReplyHandler<EBehaviour::Version>;				// Shared between @version and @versionnew
+
+    //
+    // CommandProcessor - Templated glue class that brings BehaviourInfo, CommandHandlerBaseImpl and CommandHandler together
+    //
+    template <EParamType templParamType, EBehaviour templBhvr, typename handlerImpl = CommandHandler<templParamType, templBhvr>, typename baseImpl = CommandHandlerBaseImpl<templParamType>>
+    class CommandProcessor : public BehaviourInfo
+    {
+    public:
+        // Default constructor used by behaviour specializations
+        template<typename = typename std::enable_if<templBhvr != EBehaviour::Unknown>::type>
+        CommandProcessor(const std::string& strBhvr, U32 nBhvrFlags = 0) : BehaviourInfo(strBhvr, templBhvr, templParamType, nBhvrFlags) {}
+
+        // Constructor used when we don't want to specialize on behaviour (see BehaviourGenericProcessor)
+        template<typename = typename std::enable_if<templBhvr == EBehaviour::Unknown>::type>
+        CommandProcessor(const std::string& strBhvr, EBehaviour eBhvr, U32 nBhvrFlags = 0) : BehaviourInfo(strBhvr, eBhvr, templParamType, nBhvrFlags) {}
+
+        ECmdRet processCommand(const RlvCommand& rlvCmd) const override { return baseImpl::processCommand(rlvCmd, &handlerImpl::onCommand); }
+    };
+
+    // Aliases to improve readability in definitions
+    template<EBehaviour templBhvr, typename handlerImpl = CommandHandler<EParamType::AddRem, templBhvr>> using BehaviourProcessor = CommandProcessor<EParamType::AddRem, templBhvr, handlerImpl>;
+    template<EBehaviour templBhvr, typename handlerImpl = CommandHandler<EParamType::Force, templBhvr>> using ForceProcessor = CommandProcessor<EParamType::Force, templBhvr, handlerImpl>;
+    template<EBehaviour templBhvr, typename handlerImpl = CommandHandler<EParamType::Reply, templBhvr>> using ReplyProcessor = CommandProcessor<EParamType::Reply, templBhvr, handlerImpl>;
+
+    // Provides pre-defined generic implementations of basic behaviours (template voodoo - see original commit for something that still made sense)
+    template<EBehaviourOptionType templOptionType> struct BehaviourGenericHandler { static ECmdRet onCommand(const RlvCommand& rlvCmd, bool& fRefCount); };
+    template<EBehaviourOptionType templOptionType> using BehaviourGenericProcessor = BehaviourProcessor<EBehaviour::Unknown, BehaviourGenericHandler<templOptionType>>;
+    template<EBehaviourOptionType templOptionType> struct ForceGenericHandler { static ECmdRet onCommand(const RlvCommand& rlvCmd); };
+    template<EBehaviourOptionType templOptionType> using ForceGenericProcessor = ForceProcessor<EBehaviour::Unknown, ForceGenericHandler<templOptionType>>;
+
+    // ============================================================================
+    // BehaviourProcessor and related classes - Handles add/rem comamnds aka "restrictions)
+    //
+
+    template <EBehaviour eBhvr, typename handlerImpl = BehaviourHandler<eBhvr>, typename toggleHandlerImpl = BehaviourToggleHandler<eBhvr>>
+    class BehaviourToggleProcessor : public BehaviourInfo
+    {
+    public:
+        BehaviourToggleProcessor(const std::string& strBhvr, U32 nBhvrFlags = 0) : BehaviourInfo(strBhvr, eBhvr, EParamType::AddRem, nBhvrFlags) {}
+        ECmdRet processCommand(const RlvCommand& rlvCmd) const override { return CommandHandlerBaseImpl<EParamType::AddRem>::processCommand(rlvCmd, &handlerImpl::onCommand, &toggleHandlerImpl::onCommandToggle); }
+    };
+    template <EBehaviour eBhvr, EBehaviourOptionType optionType, typename toggleHandlerImpl = BehaviourToggleHandler<eBhvr>> using RlvBehaviourGenericToggleProcessor = BehaviourToggleProcessor<eBhvr, BehaviourGenericHandler<optionType>, toggleHandlerImpl>;
+
+    // ============================================================================
+    // Various helper classes/timers/functors
+    //
+
+    struct CommandDbgOut
+    {
+        CommandDbgOut(const std::string& orig_cmd, bool for_console) : mOrigCmd(orig_cmd), mForConsole(for_console) {}
+        void add(std::string strCmd, ECmdRet eRet);
+        std::string get() const;
+        static std::string getDebugVerbFromReturnCode(ECmdRet eRet);
+        static std::string getReturnCodeString(ECmdRet eRet);
+    private:
+        std::string mOrigCmd;
+        std::map<ECmdRet, std::string> mCommandResults;
+        bool mForConsole = false;
+    };
+}
+
+// ============================================================================
+// RlvCommand
+//
+
+class RlvCommand
+{
+public:
+    explicit RlvCommand(const LLUUID& idObj, const std::string& strCmd);
+    RlvCommand(const RlvCommand& rlvCmd, Rlv::EParamType eParamType = Rlv::EParamType::Unknown);
+
+    /*
+     * Member functions
+     */
+public:
+    std::string        asString() const;
+    const std::string& getBehaviour() const { return mBehaviour; }
+    const Rlv::BehaviourInfo* getBehaviourInfo() const { return mBhvrInfo; }
+    Rlv::EBehaviour    getBehaviourType() const { return (mBhvrInfo) ? mBhvrInfo->getBehaviourType() : Rlv::EBehaviour::Unknown; }
+    U32                getBehaviourFlags() const { return (mBhvrInfo) ? mBhvrInfo->getBehaviourFlags() : 0; }
+    const LLUUID&      getObjectID() const { return mObjId; }
+    const std::string& getOption() const { return mOption; }
+    const std::string& getParam() const { return mParam; }
+    Rlv::EParamType    getParamType() const { return mParamType; }
+    bool               hasOption() const { return !mOption.empty(); }
+    bool               isBlocked() const { return (mBhvrInfo) ? mBhvrInfo->isBlocked() : false; }
+    bool               isRefCounted() const { return mIsRefCounted; }
+    bool               isStrict() const { return mIsStrict; }
+    bool               isValid() const { return mIsValid; }
+    Rlv::ECmdRet       processCommand() const { return (mBhvrInfo) ? mBhvrInfo->processCommand(*this) : Rlv::ECmdRet::FailedNoProcessor; }
+
+protected:
+    static bool parseCommand(const std::string& strCommand, std::string& strBehaviour, std::string& strOption, std::string& strParam);
+    bool               markRefCounted() const { return mIsRefCounted = true; }
+
+    /*
+     * Operators
+     */
+public:
+    bool operator ==(const RlvCommand&) const;
+
+    /*
+     * Member variables
+     */
+protected:
+    bool                    mIsValid = false;
+    LLUUID                  mObjId;
+    std::string             mBehaviour;
+    const Rlv::BehaviourInfo* mBhvrInfo = nullptr;
+    Rlv::EParamType         mParamType = Rlv::EParamType::Unknown;
+    bool                    mIsStrict = false;
+    std::string             mOption;
+    std::string             mParam;
+    mutable bool            mIsRefCounted = false;
+
+    friend class RlvHandler;
+    friend class RlvObject;
+    template<Rlv::EParamType> friend struct Rlv::CommandHandlerBaseImpl;
+};
+
+// ============================================================================
diff --git a/indra/newview/skins/default/xui/en/floater_rlv_console.xml b/indra/newview/skins/default/xui/en/floater_rlv_console.xml
new file mode 100644
index 0000000000..708055d1b6
--- /dev/null
+++ b/indra/newview/skins/default/xui/en/floater_rlv_console.xml
@@ -0,0 +1,74 @@
+<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
+<floater
+ can_resize="true"
+ height="400"
+ layout="topleft"
+ min_height="300"
+ min_width="300"
+ name="rlv_console"
+ title="RLVa console"
+ width="600"
+ >
+    <layout_stack
+     animate="false"
+     bottom="-1"
+     default_tab_group="2"
+     follows="all"
+     left="5"
+     layout="topleft"
+     mouse_opaque="false"
+     name="main_stack"
+     right="-5"
+     orientation="vertical"
+     tab_group="1"
+     top="1"
+     >
+        <layout_panel
+         name="body_panel"
+         height="235">
+            <text_editor
+             follows="all"
+             left="1"
+			 right="-1"
+			 top="0"
+             length="1"
+             font="Monospace"
+             bottom="-1"
+             ignore_tab="false"
+             layout="topleft"
+             max_length="65536"
+             name="console_output"
+             read_only="true"
+             track_end="true"
+             type="string"
+             word_wrap="true"
+            >
+            </text_editor>
+        </layout_panel>
+
+        <layout_panel
+         height="26"
+         auto_resize="false"
+         name="input_panel">
+            <chat_editor
+             layout="topleft"
+             expand_lines_count="5"
+             follows="left|right|bottom"
+             font="SansSerifSmall"
+             height="20"
+             is_expandable="true"
+             text_tentative_color="TextFgTentativeColor"
+             name="console_input"
+             max_length="1023"
+             spellcheck="true"
+             tab_group="3"
+             bottom_delta="20"
+             left="1"
+			 top="1"
+			 right="-1"
+             show_emoji_helper="false"
+             wrap="true"
+            />
+        </layout_panel>
+    </layout_stack>
+</floater>
diff --git a/indra/newview/skins/default/xui/en/menu_viewer.xml b/indra/newview/skins/default/xui/en/menu_viewer.xml
index 324e868bd5..bcd5a09d16 100644
--- a/indra/newview/skins/default/xui/en/menu_viewer.xml
+++ b/indra/newview/skins/default/xui/en/menu_viewer.xml
@@ -1838,6 +1838,71 @@ function="World.EnvPreset"
     </menu>
     <menu
      create_jump_keys="true"
+     label="RLVa"
+     name="RLVa Main"
+     tear_off="true"
+     visible="true">
+      <menu
+       label="Debug"
+       name="Debug"
+       tear_off="true">
+        <menu_item_check
+         label="Show Top-level RLVa Menu"
+         name="Show Top-level RLVa Menu">
+          <menu_item_check.on_check
+           function="CheckControl"
+           parameter="RLVaTopLevelMenu" />
+          <menu_item_check.on_click
+           function="ToggleControl"
+           parameter="RLVaTopLevelMenu" />
+        </menu_item_check>
+      	<menu_item_separator/>
+      	<menu_item_check
+      	 label="Show Debug Messages"
+      	 name="Show Debug Messages">
+          <menu_item_check.on_check
+           function="CheckControl"
+           parameter="RestrainedLoveDebug" />
+          <menu_item_check.on_click
+           function="ToggleControl"
+           parameter="RestrainedLoveDebug" />
+      	</menu_item_check>
+      	<menu_item_check
+      	 label="Hide Unset or Duplicate Messages"
+      	 name="Hide Unset or Duplicate Messages">
+          <menu_item_check.on_check
+           function="CheckControl"
+           parameter="RLVaDebugHideUnsetDuplicate" />
+          <menu_item_check.on_click
+           function="ToggleControl"
+           parameter="RLVaDebugHideUnsetDuplicate" />
+      	</menu_item_check>
+      </menu>
+      <menu_item_separator/>
+      <menu_item_check
+       label="Allow Temporary Attachments"
+       name="Allow Temporary Attachments">
+      	<menu_item_check.on_check
+      	 function="CheckControl"
+      	 parameter="RLVaEnableTemporaryAttachments" />
+      	<menu_item_check.on_click
+      	 function="ToggleControl"
+      	 parameter="RLVaEnableTemporaryAttachments" />
+      </menu_item_check>
+      <menu_item_separator />
+      <menu_item_check
+       label="Console..."
+       name="Console">
+        <menu_item_check.on_check
+      	 function="Floater.Visible"
+      	 parameter="rlv_console" />
+        <menu_item_check.on_click
+      	 function="Floater.Toggle"
+      	 parameter="rlv_console" />
+      </menu_item_check>
+    </menu>
+    <menu
+     create_jump_keys="true"
      label="Advanced"
      name="Advanced"
      tear_off="true"
@@ -2344,6 +2409,11 @@ function="World.EnvPreset"
                  parameter="flexible" />
             </menu_item_check>
         </menu>        
+        <menu
+         label="RLVa"
+         name="RLVa Embedded"
+         tear_off="true"
+         visible="true" />
         <menu_item_check
          label="Use Plugin Read Thread"
          name="Use Plugin Read Thread">
diff --git a/indra/newview/skins/default/xui/en/strings.xml b/indra/newview/skins/default/xui/en/strings.xml
index 2d04b3e0fe..cebe1ff6c3 100644
--- a/indra/newview/skins/default/xui/en/strings.xml
+++ b/indra/newview/skins/default/xui/en/strings.xml
@@ -60,6 +60,7 @@ Disk cache: [DISK_CACHE_INFO]
 HiDPI display mode: [HIDPI]
 	</string>
 	<string name="AboutLibs">
+RestrainedLove API: [RLV_VERSION]
 J2C Decoder Version: [J2C_VERSION]
 Audio Driver Version: [AUDIO_DRIVER_VERSION]
 [LIBCEF_VERSION]
@@ -4375,4 +4376,31 @@ and report the problem.
 [https://community.secondlife.com/knowledgebase/english/error-messages-r520/#Section__3 Knowledge Base]
   </string>
 
+  <!-- RLVa -->
+  <string name="RlvConsoleDisable">RLVa is disabled</string>
+  <string name="RlvConsoleInvalidCmd">Invalid command</string>
+  <string name="RlvConsoleExecuted">INFO</string>
+  <string name="RlvConsoleFailed">ERR</string>
+  <string name="RlvConsoleRetained">RET</string>
+  <string name="RlvDebugExecuted">executed</string>
+  <string name="RlvDebugFailed">failed</string>
+  <string name="RlvDebugRetained">retained</string>
+  <string name="RlvReturnCodeUnset">unset</string>
+  <string name="RlvReturnCodeDuplicate">duplicate</string>
+  <string name="RlvReturnCodeDelayed">delayed</string>
+  <string name="RlvReturnCodeDeprecated">deprecated</string>
+  <string name="RlvReturnCodeSyntax">thingy error</string>
+  <string name="RlvReturnCodeOption">invalid option</string>
+  <string name="RlvReturnCodeParam">invalid param</string>
+  <string name="RlvReturnCodeLock">locked command</string>
+  <string name="RlvReturnCodeDisabled">disabled command</string>
+  <string name="RlvReturnCodeUnknown">unknown command</string>
+  <string name="RlvReturnCodeNoSharedRoot">missing #RLV</string>
+  <string name="RlvReturnCodeDeprecatedAndDisabled">deprecated and disabled</string>
+  <string name="RlvReturnCodeNoBehaviour">no active behaviours</string>
+  <string name="RlvReturnCodeUnheldBehaviour">base behaviour not held</string>
+  <string name="RlvReturnCodeBlocked">blocked object</string>
+  <string name="RlvReturnCodeThrottled">throttled</string>
+  <string name="RlvReturnCodeNoProcessor">no command processor found</string>
+
 </strings>