display-name

    Specifies a display to be extracted. You can specify any of the
    following entities:

    o  A predefined display:

          SRC
          OUT
          PROMPT
          INST
          REG
          FREG (Alpha and Integrity servers only)
          IREG

    o  A display previously created with the DISPLAY command

    You can use the asterisk (*)  wildcard character in a display
    name. Do not specify a display name with the /ALL qualifier.

 file-spec

    Specifies the file to which the information is written. You can
    specify a logical name.

    If you specify /SCREEN_LAYOUT, the default specification for
    the file is SYS$DISK:[]DBGSCREEN.COM. Otherwise, the default
    specification is SYS$DISK:[]DEBUG.TXT.