ulClipflags (ULONG) - input

      Clipping control flags.

      PSF_CLIPSIBLINGS

        Clip out all siblings of hwnd.
      PSF_CLIPCHILDREN
        Clip out all children of hwnd.
      PSF_CLIPUPWARDS
        Taking hwndClipWindow as a reference window, clip out all sibling windows before hwndClipWindow. This value may not be used with PSF_CLIPDOWNWARDS.
      PSF_CLIPDOWNWARDS
        Taking hwndClipWindow as a reference window, clip out all sibling windows after hwndClipWindow. This value may not be used with PSF_CLIPUPWARDS.
      PSF_LOCKWINDOWUPDATE
        Calculate a presentation space that keeps a visible region even though output may be locked by the WinLockWindowUpdate function.
      PSF_PARENTCLIP
        Calculate a presentation space that uses the visible region of the parent of hwnd but with an origin calculated for hwnd.

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