VMS Help SET, DISPLAY, Qualifiers, /DELETE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Cancels the redirected display by deassigning the logical name
    DECW$DISPLAY and deleting the created display device. If you
    specified a logical name as the display-device parameter with
    the SET DISPLAY/CREATE command, entering the SET DISPLAY/DELETE
    display-device command cancels the redirected display by
    deassigning the logical name you specified and deleting the
    created display device.

    The DECwindows Session Manager defines DECW$DISPLAY in your job
    logical name table when you open a terminal (DECterm) window.
    When you redirect application output to another workstation
    with the SET DISPLAY/CREATE command, an additional DECW$DISPLAY
    logical name is defined in your process logical name table. This
    definition supersedes the definition in the job logical name
    table. Output from applications run from the process in which
    you executed the SET DISPLAY/CREATE command will be displayed on
    the workstation referred to by the definition of DECW$DISPLAY in
    the process logical name table. Enter the SHOW DISPLAY command
    to see where this application will be displayed. To see whether
    multiple definitions for DECW$DISPLAY exist, enter the command
    SHOW LOGICAL DECW$DISPLAY.

    If DECW$DISPLAY is still defined (for example, in the job
    logical name table) after you specify the /DELETE qualifier, any
    DECwindows applications run from this process will be displayed
    on the workstation device to which output is now directed. Enter
    the SHOW DISPLAY command if you are unsure of the node to which
    DECW$DISPLAY refers.

                                 CAUTION

       If you modify or delete the definition of DECW$DISPLAY from
       the job logical name table, you will be unable to start
       another session. Be careful not to specify the /DELETE
       qualifier without having first redirected the display with
       the SET DISPLAY/CREATE command.

    You cannot specify the /DELETE and /CREATE qualifiers on the same
    command line.