VMS Help RTL Routines, SMG$, SMG$CHECK_FOR_OCCLUSION  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The Check for Occlusion routine checks to see whether a virtual
    display is covered (occluded) by another virtual display.

    Format

      SMG$CHECK_FOR_OCCLUSION  display-id ,pasteboard-id

                               ,occlusion-state

  Additional Information (explode) :

• Returns
• Arguments