diff --git a/EInAPI.h b/EInAPI.h
index 6bfeb0c..38c24f8 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -57,6 +57,7 @@ typedef int (__stdcall * pfProcEvents) (int, int) ;
 EIN_EXPORT BOOL __stdcall EgtSetProcessEvents( pfProcEvents pFun) ;
 typedef BOOL (__stdcall * pfOutTextW) (wchar_t*&) ;
 EIN_EXPORT BOOL __stdcall EgtSetOutText( pfOutTextW pFun) ;
+EIN_EXPORT BOOL __stdcall EgtSetMainWindowHandle( HWND hMainWnd) ;
 
 // UiUnits
 EIN_EXPORT BOOL __stdcall EgtSetUiUnits( BOOL bMM) ;
diff --git a/EXeExecutor.h b/EXeExecutor.h
index ddaf648..f1dbd5f 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -60,6 +60,7 @@ EXE_EXPORT int  ExeProcessEvents( int nProg, int nPause) ;
 typedef bool (__stdcall * pfOutText) ( const std::string&) ;
 EXE_EXPORT bool ExeSetOutText( pfOutText pFun) ;
 EXE_EXPORT bool ExeOutText( const std::string& sText) ;
+EXE_EXPORT bool ExeSetMainWindowHandle( HWND hMainWnd) ;
 
 // UiUnits
 EXE_EXPORT bool ExeSetUiUnits( bool bMM) ;