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diff --git a/public/appframework/tier3app.h b/public/appframework/tier3app.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// The copyright to the contents herein is the property of Valve, L.L.C.
+// The contents may be used and/or copied only with the written permission of
+// Valve, L.L.C., or in accordance with the terms and conditions stipulated in
+// the agreement/contract under which the contents have been supplied.
+//
+// $Header: $
+// $NoKeywords: $
+//
+// The application objects for apps that use tier3
+//=============================================================================
+
+#ifndef TIER3APP_H
+#define TIER3APP_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "appframework/tier2app.h"
+#include "tier3/tier3.h"
+#include "vgui_controls/Controls.h"
+
+
+//-----------------------------------------------------------------------------
+// The application object for apps that use tier3
+//-----------------------------------------------------------------------------
+class CTier3SteamApp : public CTier2SteamApp
+{
+	typedef CTier2SteamApp BaseClass;
+
+public:
+	// Methods of IApplication
+	virtual bool PreInit()
+	{
+		if ( !BaseClass::PreInit() )
+			return false;
+
+		CreateInterfaceFn factory = GetFactory();
+		ConnectTier3Libraries( &factory, 1 );
+		return true;			
+	}
+
+	virtual void PostShutdown()
+	{
+		DisconnectTier3Libraries();
+		BaseClass::PostShutdown();
+	}
+};
+
+
+//-----------------------------------------------------------------------------
+// The application object for apps that use tier3
+//-----------------------------------------------------------------------------
+class CTier3DmSteamApp : public CTier2DmSteamApp
+{
+	typedef CTier2DmSteamApp BaseClass;
+
+public:
+	// Methods of IApplication
+	virtual bool PreInit()
+	{
+		if ( !BaseClass::PreInit() )
+			return false;
+
+		CreateInterfaceFn factory = GetFactory();
+		ConnectTier3Libraries( &factory, 1 );
+		return true;			
+	}
+
+	virtual void PostShutdown()
+	{
+		DisconnectTier3Libraries();
+		BaseClass::PostShutdown();
+	}
+};
+
+
+//-----------------------------------------------------------------------------
+// The application object for apps that use vgui
+//-----------------------------------------------------------------------------
+class CVguiSteamApp : public CTier3SteamApp
+{
+	typedef CTier3SteamApp BaseClass;
+
+public:
+	// Methods of IApplication
+	virtual bool PreInit()
+	{
+		if ( !BaseClass::PreInit() )
+			return false;
+
+		CreateInterfaceFn factory = GetFactory();
+		return vgui::VGui_InitInterfacesList( "CVguiSteamApp", &factory, 1 );
+	}
+};
+
+
+//-----------------------------------------------------------------------------
+// The application object for apps that use vgui
+//-----------------------------------------------------------------------------
+class CVguiDmSteamApp : public CTier3DmSteamApp
+{
+	typedef CTier3DmSteamApp BaseClass;
+
+public:
+	// Methods of IApplication
+	virtual bool PreInit()
+	{
+		if ( !BaseClass::PreInit() )
+			return false;
+
+		CreateInterfaceFn factory = GetFactory();
+		return vgui::VGui_InitInterfacesList( "CVguiSteamApp", &factory, 1 );
+	}
+};
+
+
+#endif // TIER3APP_H