hwndDesktop (HWND) - input

      Desktop-window handle.

      HWND_DESKTOP

        The desktop-window handle
      Other
        Specified desktop-window handle.

      hwnd (HWND) - returns

        Handle of the window with the pointer captured.

        NULLHANDLE

          No window has the pointer captured, or an error occurred
        Handle
          Handle of the window with the pointer captured.

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