Displays information about data structures related to Write
    Bitmap (WBM). Bitmaps are used by Host-Base Volume Shadowing
    (HBVS) for the implementation of Mini Copy and Host-Based
    Minimerge (HBMM). If the /BITMAP qualifier is specified with a
    device that is not an HBVS virtual unit, the error NOSUCHDEV is
    returned.

    A device name must be specified. If SHOW DEVICE/BITMAP DS is
    entered, bitmaps for all HBVS virtual units are displayed.