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its easy!

in your WndProc, add a trapping for

#define WM_QUERYENDSESSION  0x11
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
  switch( message )
  {
    case WM_QUERYENDSESSION:
      return 0; // cancel the shutdown
  }
}

That’s really it!

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