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diff --git a/source/gameengine/SceneGraph/SG_IObject.h b/source/gameengine/SceneGraph/SG_IObject.h
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+++ b/source/gameengine/SceneGraph/SG_IObject.h
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+/**
+ * $Id$
+ *
+ * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version. The Blender
+ * Foundation also sells licenses for use in proprietary software under
+ * the Blender License.  See http://www.blender.org/BL/ for information
+ * about this.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL/BL DUAL LICENSE BLOCK *****
+ */
+#ifndef __SG_IOBJECT
+#define __SG_IOBJECT
+/**
+base object that can be part of the scenegraph.
+*/
+#include <vector>
+
+
+class SG_Controller;
+class SG_IObject;
+
+typedef std::vector<SG_Controller*> SGControllerList;
+
+typedef void* (*SG_ReplicationNewCallback)(
+	SG_IObject* sgobject,
+	void*	clientobj,
+	void*	clientinfo
+);
+
+typedef void* (*SG_DestructionNewCallback)(
+	SG_IObject* sgobject,
+	void*	clientobj,
+	void*	clientinfo
+);
+
+
+/**
+ * SG_Callbacks hold 2 call backs to the outside world.
+ * The first is meant to be called when objects are replicated.
+ * And allows the outside world to syncronise external objects
+ * with replicated nodes and their children.
+ * The second is called when a node is detroyed and again
+ * is their for synconisation purposes
+ * These callbacks may both be NULL. 
+ * The efficacy of this approach has not been proved some 
+ * alternatives might be to perform all replication and destruction
+ * externally. 
+ * To define a class interface rather than a simple function
+ * call back so that replication information can be transmitted from 
+ * parent->child. 
+ */
+struct	SG_Callbacks
+{
+	SG_Callbacks(
+	):
+		m_replicafunc(NULL),
+		m_destructionfunc(NULL) 
+	{
+	};
+		
+	SG_Callbacks(
+		SG_ReplicationNewCallback repfunc,
+		SG_DestructionNewCallback destructfunc
+	): 
+		m_replicafunc(repfunc),
+		m_destructionfunc(destructfunc) 
+	{
+	};
+
+	SG_ReplicationNewCallback	m_replicafunc;
+	SG_DestructionNewCallback	m_destructionfunc;
+};
+
+class SG_IObject
+{
+private :
+
+	void*	m_SGclientObject;
+	void*	m_SGclientInfo;
+	SG_Callbacks m_callbacks;
+	SGControllerList	m_SGcontrollers;
+
+public:
+
+
+	virtual ~SG_IObject();
+
+
+	/**
+	 * Add a pointer to a controller allocated on the heap, to 
+	 * this node. This memory for this controller becomes the 
+	 * responsibility of this class. It will be deleted when
+	 * this object is deleted.
+	 */
+	
+		void				
+	AddSGController(
+		SG_Controller* cont
+	);
+
+	/** 
+	 * Clear the array of pointers to controllers associated with 
+	 * this node. This does not delete the controllers themselves!
+     * This should be used very carefully to avoid memory
+	 * leaks.
+	 */
+	
+		void				
+	RemoveAllControllers(
+	); 
+
+	/// Needed for replication
+
+	/** 
+	 * Return a reference to this node's controller list. 
+	 * Whilst we don't wish to expose full control of the container
+	 * to the user we do allow them to call non_const methods
+	 * on pointers in the container. C++ topic: how to do this in
+	 * using STL? 
+	 */
+
+		SGControllerList&	
+	GetSGControllerList(
+	);
+
+	
+	/**
+	 * Get the client object associated with this
+	 * node. This interface allows you to associate
+	 * arbitray external objects with this node. They are
+	 * passed to the callback functions when they are 
+	 * activated so you can syncronise these external objects
+	 * upon replication and destruction
+	 * This may be NULL.
+	 */
+
+		void*				
+	GetSGClientObject(
+	);
+
+	const 
+		void*			
+	GetSGClientObject(
+	) const	;
+
+	
+	/**
+	 * Set the client object for this node. This is just a 
+	 * pointer to an object allocated that should exist for 
+	 * the duration of the lifetime of this object, or untill
+	 * this function is called again.
+	 */
+	
+		void	
+	SetSGClientObject(
+		void* clientObject
+	);
+
+	/** 
+	 * Set the current simulation time for this node.
+	 * The implementation of this function runs through
+	 * the nodes list of controllers and calls their SetSimulatedTime methods
+	 */
+ 
+		void		
+	SetControllerTime(
+		double time
+	);
+	
+	virtual 
+		void		
+	Destruct(
+	) = 0;
+
+protected :
+
+		void
+	ActivateReplicationCallback(
+		SG_IObject *replica
+	);
+
+		void
+	ActivateDestructionCallback(
+	);
+
+	SG_IObject(
+		void* clientobj,
+		void* clientinfo,
+		SG_Callbacks callbacks
+	);
+
+	SG_IObject(
+		const SG_IObject &other
+	);
+
+
+};
+
+#endif //__SG_IOBJECT