hwndDeskTop (HWND) - input

      Desktop-window handle.

      HWND_DESKTOP

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

      hpsScreenPS (HPS) - returns

        Presentation-space handle.

        A micro presentation space that can be used for drawing over the entire desktop window (the whole screen).

        NULLHANDLE

          hwndDeskTop is not HWND_DESKTOP or a desktop window handle obtained from the WinQueryDesktopWindow function.
        Other
          Presentation space handle.

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