Library /sys$common/syshlp/helplib.hlb  —  SHOW  DEVICES  Qualifiers  /WINDOWS
    Displays the window count and total size of all windows for files
    open on a volume. The file name and related process name and
    process identification (PID) are also displayed. The letter C
    in a display indicates that the file is open with "cathedral
    windows" (segmented windows).
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