Library /sys$common/syshlp/helplib.hlb  —  SHOW  DEVICES  Qualifiers  /BITMAP
       /BITMAP ddcu:

    Displays information regarding minicopy or HBMM (Host-Based
    Minimerge) bitmaps for the given shadow set;

    Note that the SHOW DEVICES/FULL ddcu: display also displays
    status to indicate that bitmaps are active on the device.
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