diff --git a/apps/openmw/mwscript/docs/vmformat.txt b/apps/openmw/mwscript/docs/vmformat.txt
index dcd97f377a..7e3776e189 100644
--- a/apps/openmw/mwscript/docs/vmformat.txt
+++ b/apps/openmw/mwscript/docs/vmformat.txt
@@ -34,5 +34,6 @@ op 0x2000009: PlayLoopSound3DVP
 op 0x200000a: StopSound
 op 0x200000b: GetSoundPlaying
 op 0x200000c: XBox (always 0)
-opcodes 0x200000d-0x3ffffff unused
+op 0x200000d: OnActivate
+opcodes 0x200000e-0x3ffffff unused
 
diff --git a/apps/openmw/mwscript/interpretercontext.cpp b/apps/openmw/mwscript/interpretercontext.cpp
index b06401a3a9..a2f6663f3b 100644
--- a/apps/openmw/mwscript/interpretercontext.cpp
+++ b/apps/openmw/mwscript/interpretercontext.cpp
@@ -154,6 +154,11 @@ namespace MWScript
         return std::sqrt (diff[0]*diff[0] + diff[1]*diff[1] + diff[2]*diff[2]);
     }
     
+    bool InterpreterContext::hasBeenActivated() const
+    {
+        return false;
+    }
+    
     MWWorld::World& InterpreterContext::getWorld()
     {
         return *mEnvironment.mWorld;
diff --git a/apps/openmw/mwscript/interpretercontext.hpp b/apps/openmw/mwscript/interpretercontext.hpp
index 22cb14e459..21fb35d044 100644
--- a/apps/openmw/mwscript/interpretercontext.hpp
+++ b/apps/openmw/mwscript/interpretercontext.hpp
@@ -69,6 +69,8 @@ namespace MWScript
                         
             virtual float getDistance (const std::string& name);
                         
+            virtual bool hasBeenActivated() const;
+                        
             MWWorld::World& getWorld();
             
             MWSound::SoundManager& getSoundManager();
diff --git a/apps/openmw/mwscript/miscextensions.cpp b/apps/openmw/mwscript/miscextensions.cpp
index e7956c3ad1..3d865d56fa 100644
--- a/apps/openmw/mwscript/miscextensions.cpp
+++ b/apps/openmw/mwscript/miscextensions.cpp
@@ -7,6 +7,8 @@
 #include <components/interpreter/runtime.hpp>
 #include <components/interpreter/opcodes.hpp>
 
+#include "interpretercontext.hpp"
+
 namespace MWScript
 {
     namespace Misc
@@ -21,18 +23,30 @@ namespace MWScript
                 } 
         };
     
+        class OpOnActivate : public Interpreter::Opcode0
+        {
+            public:
+            
+                virtual void execute (Interpreter::Runtime& runtime)
+                {
+                    runtime.push (static_cast<InterpreterContext&> (
+                        runtime.getContext()).hasBeenActivated());
+                } 
+        };
+    
         const int opcodeXBox = 0x200000c;
-        
-
+        const int opcodeOnActivate = 0x200000d;       
     
         void registerExtensions (Compiler::Extensions& extensions)
         {
             extensions.registerFunction ("xbox", 'l', "", opcodeXBox);
+            extensions.registerFunction ("onactivate", 'l', "", opcodeOnActivate);
         }
         
         void installOpcodes (Interpreter::Interpreter& interpreter)
         {
             interpreter.installSegment5 (opcodeXBox, new OpXBox);
+            interpreter.installSegment5 (opcodeOnActivate, new OpOnActivate);
         }    
     }        
 }