HELPLIB.HLB  —  SET  DISPLAY  Qualifiers  /USER_MODE
    Creates a user-mode display device and assigns the logical name
    DECW$DISPLAY to point to it. This qualifier must be used with
    the /CREATE qualifier. The lifetime of a user-mode device is
    one DECwindows image: when the next DECwindows image exits, the
    device is deleted.
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