diff --git a/EInAPI.h b/EInAPI.h
index 2a4f062..6004cc0 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -539,6 +539,7 @@ EIN_EXPORT BOOL __stdcall EgtMdbGetSafeZ( double* pdSafeZ) ;
 EIN_EXPORT BOOL __stdcall EgtMdbSave( void) ;
 EIN_EXPORT BOOL __stdcall EgtMdbGetMachiningDir( wchar_t*& wsMchDir) ;
 // Operations
+EIN_EXPORT BOOL __stdcall EgtRemoveOperation( int nId) ;
 EIN_EXPORT BOOL __stdcall EgtRemoveAllOperations( void) ;
 // Simulation
 EIN_EXPORT BOOL __stdcall EgtSimStart( void) ;
diff --git a/EMkMachMgr.h b/EMkMachMgr.h
index 2bc3fd9..6aa82b4 100644
--- a/EMkMachMgr.h
+++ b/EMkMachMgr.h
@@ -143,7 +143,8 @@ class __declspec( novtable) IMachMgr
       virtual bool SetMachiningParam( int nType, double dVal) = 0 ;
       virtual bool SetMachiningParam( int nType, const std::string& sVal) = 0 ;
       virtual bool SetMachiningGeometry( const SELVECTOR& vIds) = 0 ;
-      virtual bool MachiningApply( void) = 0 ;
+      virtual bool MachiningPreview( bool bRecalc) = 0 ;
+      virtual bool MachiningApply( bool bRecalc) = 0 ;
       virtual bool GetMachiningParam( int nType, bool& bVal) const = 0 ;
       virtual bool GetMachiningParam( int nType, int& dVal) const = 0 ;
       virtual bool GetMachiningParam( int nType, double& dVal) const = 0 ;
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 1b77b64..97b60fb 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -567,7 +567,8 @@ EXE_EXPORT bool ExeSetMachiningParam( int nType, int nVal) ;
 EXE_EXPORT bool ExeSetMachiningParam( int nType, double dVal) ;
 EXE_EXPORT bool ExeSetMachiningParam( int nType, const std::string& sVal) ;
 EXE_EXPORT bool ExeSetMachiningGeometry( const SELVECTOR& vIds) ;
-EXE_EXPORT bool ExeApplyMachining( void) ;
+EXE_EXPORT bool ExePreviewMachining( bool bRecalc) ;
+EXE_EXPORT bool ExeApplyMachining( bool bRecalc) ;
 EXE_EXPORT bool ExeGetMachiningParam( int nType, bool& bVal) ;
 EXE_EXPORT bool ExeGetMachiningParam( int nType, int& nVal) ;
 EXE_EXPORT bool ExeGetMachiningParam( int nType, double& dVal) ;