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RTL Routines, SMG$, SMG$CHECK_FOR_OCCLUSION
 *Conan The Librarian 

    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) :

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