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diff --git a/common/IRunGameEngine.h b/common/IRunGameEngine.h
new file mode 100644
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+++ b/common/IRunGameEngine.h
@@ -0,0 +1,81 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+#ifndef IRUNGAMEENGINE_H
+#define IRUNGAMEENGINE_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "interface.h"
+
+#ifdef GetUserName
+#undef GetUserName
+#endif
+
+//-----------------------------------------------------------------------------
+// Purpose: Interface to running the game engine
+//-----------------------------------------------------------------------------
+abstract_class IRunGameEngine : public IBaseInterface
+{
+public:
+	// Returns true if the engine is running, false otherwise.
+	virtual bool IsRunning() = 0;
+
+	// Adds text to the engine command buffer. Only works if IsRunning()
+	// returns true on success, false on failure
+	virtual bool AddTextCommand(const char *text) = 0;
+
+	// runs the engine with the specified command line parameters.  Only works if !IsRunning()
+	// returns true on success, false on failure
+	virtual bool RunEngine(const char *gameDir, const char *commandLineParams) = 0;
+
+	// returns true if the player is currently connected to a game server
+	virtual bool IsInGame() = 0;
+
+	// gets information about the server the engine is currently connected to
+	// returns true on success, false on failure
+	virtual bool GetGameInfo(char *infoBuffer, int bufferSize) = 0;
+
+	// tells the engine our userID
+	virtual void SetTrackerUserID(int trackerID, const char *trackerName) = 0;
+
+	// this next section could probably moved to another interface
+	// iterates users
+	// returns the number of user
+	virtual int GetPlayerCount() = 0;
+
+	// returns a playerID for a player
+	// playerIndex is in the range [0, GetPlayerCount)
+	virtual unsigned int GetPlayerFriendsID(int playerIndex) = 0;
+
+	// gets the in-game name of another user, returns NULL if that user doesn't exists
+	virtual const char *GetPlayerName(int friendsID, char *name, int namelen) = 0;
+
+	// gets the friends name of a player
+	virtual const char *GetPlayerFriendsName(int friendsID, char *name, int namelen) = 0;
+
+	// returns the engine build number and mod version string for server versioning
+	virtual unsigned int GetEngineBuildNumber() = 0;
+	virtual const char *GetProductVersionString() = 0;
+
+	// new interface to RunEngine (done so we don't have to roll the interface version)
+	virtual bool RunEngine2(const char *gameDir, const char *commandLineParams, bool isSourceGame) = 0;
+
+	enum ERunResult
+	{
+		k_ERunResultOkay = 0,
+		k_ERunResultModNotInstalled = 1,
+		k_ERunResultAppNotFound = 2,
+		k_ERunResultNotInitialized = 3,
+	};
+	virtual ERunResult RunEngine( int iAppID, const char *gameDir, const char *commandLineParams ) = 0;
+
+};
+
+#define RUNGAMEENGINE_INTERFACE_VERSION "RunGameEngine005"
+
+#endif // IRUNGAMEENGINE_H