Library /sys$common/syshlp/dbg$help.hlb DEBUG, EXPAND, Parameters  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 display-name

    Specifies a display to be expanded or contracted. You can specify
    any of the following entities:

    o  A predefined display:

          SRC
          OUT
          PROMPT
          INST
          REG
          FREG (Alpha only)
          IREG

    o  A display previously created with the DISPLAY command

    o  A display built-in symbol:

          %CURDISP
          %CURSCROLL
          %NEXTDISP
          %NEXTINST
          %NEXTOUTPUT
          %NEXTSCROLL
          %NEXTSOURCE

    If you do not specify a display, the current scrolling display,
    as established by the SELECT command, is chosen.