Library /sys$common/syshlp/helplib.hlb  —  RTL Routines, SMG$  SMG$CHECK_FOR_OCCLUSION
    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 extract
Returns Arguments
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