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+/** 
+ * @file llviewerhelp.h
+ * @brief Utility functions for the Help system
+ * @author Tofu Linden
+ *
+ * $LicenseInfo:firstyear=2009&license=viewergpl$
+ * 
+ * Copyright (c) 2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLVIEWERHELP_H
+#define LL_LLVIEWERHELP_H
+
+// The Help UI lives in llfloaterhelpbrowser, llviewerhelp provides a
+// layer of abstraction that protects help-system-using code from the details of
+// the Help UI floater and how help topics are converted into URLs.
+
+#include "llhelp.h" // our abstract base
+#include "llsingleton.h"
+
+class LLUICtrl;
+
+class LLViewerHelp : public LLHelp, public LLSingleton<LLViewerHelp>
+{
+	friend class LLSingleton<LLViewerHelp>;
+
+ public:
+	/// display the specified help topic in the help viewer
+	/*virtual*/ void showTopic(const std::string &topic);
+
+	/// return default (fallback) topic name suitable for showTopic()
+	/*virtual*/ std::string defaultTopic();
+
+	// return topic derived from viewer UI focus, else default topic
+	std::string getTopicFromFocus();
+
+ private:
+	static void showHelp(); // make sure help UI is visible & raised
+	static void setRawURL(std::string url); // send URL to help UI
+};
+
+#endif // header guard