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diff --git a/Stars45/SimObject.h b/Stars45/SimObject.h
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+/*  Starshatter OpenSource Distribution
+    Copyright (c) 1997-2004, Destroyer Studios LLC.
+    All Rights Reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice,
+      this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright notice,
+      this list of conditions and the following disclaimer in the documentation
+      and/or other materials provided with the distribution.
+    * Neither the name "Destroyer Studios" nor the names of its contributors
+      may be used to endorse or promote products derived from this software
+      without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+    POSSIBILITY OF SUCH DAMAGE.
+
+    SUBSYSTEM:    Stars.exe
+    FILE:         SimObject.h
+    AUTHOR:       John DiCamillo
+
+
+    OVERVIEW
+    ========
+    Simulation Object and Observer classes
+*/
+
+#ifndef SimObject_h
+#define SimObject_h
+
+#include "Types.h"
+#include "Physical.h"
+#include "List.h"
+
+// +--------------------------------------------------------------------+
+
+class Sim;
+class SimRegion;
+class SimObject;
+class SimObserver;
+class Scene;
+
+// +--------------------------------------------------------------------+
+
+class SimObject : public Physical
+{
+    friend class SimRegion;
+
+public:
+    static const char* TYPENAME() { return "SimObject"; }
+
+    enum TYPES { 
+        SIM_SHIP=100,
+        SIM_SHOT,
+        SIM_DRONE,
+        SIM_EXPLOSION,
+        SIM_DEBRIS,
+        SIM_ASTEROID
+    };
+
+    SimObject()                        :                region(0), objid(0), active(0), notifying(0) { }
+    SimObject(const char* n, int t=0)  : Physical(n,t), region(0), objid(0), active(0), notifying(0) { }
+    virtual ~SimObject();
+
+    virtual SimRegion*   GetRegion()                const { return region; }
+    virtual void         SetRegion(SimRegion* rgn)        { region = rgn;  }
+
+    virtual void         Notify();
+    virtual void         Register(SimObserver* obs);
+    virtual void         Unregister(SimObserver* obs);
+
+    virtual void         Activate(Scene& scene);
+    virtual void         Deactivate(Scene& scene);
+
+    virtual DWORD        GetObjID()                 const { return objid;   }
+    virtual void         SetObjID(DWORD id)               { objid = id;     }
+
+    virtual bool         IsHostileTo(const SimObject* o)
+    const { return false;   }
+
+protected:
+    SimRegion*           region;
+    List<SimObserver>    observers;
+    DWORD                objid;
+    bool                 active;
+    bool                 notifying;
+};
+
+// +--------------------------------------------------------------------+
+
+class SimObserver
+{
+public:
+    static const char* TYPENAME() { return "SimObserver"; }
+
+    virtual ~SimObserver();
+
+    int operator == (const SimObserver& o) const { return this == &o; }
+
+    virtual bool         Update(SimObject* obj);
+    virtual const char*  GetObserverName() const;
+
+    virtual void         Observe(SimObject* obj);
+    virtual void         Ignore(SimObject* obj);
+
+
+protected:
+    List<SimObject>      observe_list;
+};
+
+#endif SimObject_h
+