diff --git a/EXE_MachMgr.cpp b/EXE_MachMgr.cpp
index 52f55e5..6109c6a 100644
--- a/EXE_MachMgr.cpp
+++ b/EXE_MachMgr.cpp
@@ -2216,12 +2216,12 @@ ExeIsMachiningEmpty( void)
 //    Simulazione
 //-----------------------------------------------------------------------------
 bool
-ExeSimStart( void)
+ExeSimStart( bool bFirst)
 {
    IMachMgr* pMachMgr = GetCurrMachMgr() ;
    VERIFY_MACHMGR( pMachMgr, false)
   // avvio la simulazione della macchinata corrente
-   return pMachMgr->SimStart() ;
+   return pMachMgr->SimStart( bFirst) ;
 }
 
 //-----------------------------------------------------------------------------
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index db0c62b..85927ea 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/LUA_MachMgr.cpp b/LUA_MachMgr.cpp
index 10b7609..25e8fb9 100644
--- a/LUA_MachMgr.cpp
+++ b/LUA_MachMgr.cpp
@@ -2390,10 +2390,12 @@ LuaIsMachiningEmpty( lua_State* L)
 static int
 LuaSimStart( lua_State* L)
 {
-  // nessun parametro
+  // nessuno o 1 parametro : [bStart]
+   bool bStart = true ;
+   LuaGetParam( L, 1, bStart) ;
    LuaClearStack( L) ;
   // avvio la simulazione
-   bool bOk = ExeSimStart() ;
+   bool bOk = ExeSimStart( bStart) ;
   // restituisco il risultato
    LuaSetParam( L, bOk) ;
    return 1 ;