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diff --git a/indra/llcommon/lleventapi.h b/indra/llcommon/lleventapi.h
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+++ b/indra/llcommon/lleventapi.h
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+/**
+ * @file   lleventapi.h
+ * @author Nat Goodspeed
+ * @date   2009-10-28
+ * @brief  LLEventAPI is the base class for every class that wraps a C++ API
+ *         in an event API
+ * (see https://wiki.lindenlab.com/wiki/Incremental_Viewer_Automation/Event_API).
+ * 
+ * $LicenseInfo:firstyear=2009&license=viewergpl$
+ * Copyright (c) 2009, Linden Research, Inc.
+ * $/LicenseInfo$
+ */
+
+#if ! defined(LL_LLEVENTAPI_H)
+#define LL_LLEVENTAPI_H
+
+#include "lleventdispatcher.h"
+#include "llinstancetracker.h"
+#include <string>
+
+/**
+ * LLEventAPI not only provides operation dispatch functionality, inherited
+ * from LLDispatchListener -- it also gives us event API introspection.
+ * Deriving from LLInstanceTracker lets us enumerate instances.
+ */
+class LLEventAPI: public LLDispatchListener,
+                  public LLInstanceTracker<LLEventAPI, std::string>
+{
+    typedef LLDispatchListener lbase;
+    typedef LLInstanceTracker<LLEventAPI, std::string> ibase;
+
+public:
+    /**
+     * @param name LLEventPump name on which this LLEventAPI will listen. This
+     * also serves as the LLInstanceTracker instance key.
+     * @param desc Documentation string shown to a client trying to discover
+     * available event APIs.
+     * @param field LLSD::Map key used by LLDispatchListener to look up the
+     * subclass method to invoke [default "op"].
+     */
+    LLEventAPI(const std::string& name, const std::string& desc, const std::string& field="op");
+    virtual ~LLEventAPI();
+
+    /// Get the string name of this LLEventAPI
+    std::string getName() const { return ibase::getKey(); }
+    /// Get the documentation string
+    std::string getDesc() const { return mDesc; }
+
+private:
+    std::string mDesc;
+};
+
+#endif /* ! defined(LL_LLEVENTAPI_H) */