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Yes I tried it works fine.. but the answer is half as you should also tell me how to remove the process from memory? or the process itself has to kill itself.. pl. explain.
thanks for the answer

Well, to unregister it, simply use
                    if  (   !RegisterServiceProcess (   GetCurrentProcessId (),
                                                        RSP_UNREGISTER_SERVICE    
                                                    )
                        )
                        {
                          // error
                        }

To remove it from memory, simply terminate the program as usual, (e.g. using 'ExitProcess()').
But i think your problem is to get notified when to terminate - one easy way would be to set up an 'invisible' window, e.g.

WNDCLASS wndclass;
MSG      uMsg;
HWND     hWnd;


     wndclass.lpszClassName = "InvisibleApp";
     wndclass.hInstance     = hInstance;
     wndclass.lpfnWndProc   = WndProc;
     wndclass.hCursor       = LoadCursor(NULL,IDI_APPLICATION);
     wndclass.hIcon         = LoadIcon(0,IDI_EXCLAMATION);
     wndclass.lpszMenuName  = NULL;
     wndclass.hbrBackground = COLOR_BACKGROUND+1;
     wndclass.style         = NULL;
     wndclass.cbClsExtra    = 0;
     wndclass.cbWndExtra    = 0;

     RegisterClass(&wndclass);


    hWnd=CreateWindow(  "InvisibleApp",
                        "InvisibleApp",
                        WS_OVERLAPPEDWINDOW|WS_ICONIC,
                        CW_USEDEFAULT,
                        0,
                        CW_USEDEFAULT,
                        0,
                        NULL,
                        NULL,
                        hInstance,
                        NULL);

   while(GetMessage(&uMsg,0,0,0))
        {
         TranslateMessage(&uMsg);
         DispatchMessage(&uMsg);
        };


LONG FAR PASCAL WndProc(HWND     hWnd,
                        unsigned uMsg,
                        WPARAM   wParam,
                        LPARAM   lParam)
{
  //Process messages  
   switch(uMsg)
   {
    case WM_ENDSESSION: ExitProcess ( 0); break;
    default:       return(
                          DefWindowProc(hWnd,
                                        uMsg,
                                        wParam,
                                        lParam)
                         );

    return  ( 0);
}

Or, in MFX, simply override CWnd::OnEndSession ...

Sorry, MFX sould of course read MFC ;-)

Thanks I works fine