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

 disp-name

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

    o  A predefined display: SRC, OUT, PROMPT, PLOT

    o  A display previously created with the SET DISPLAY command

    o  A pseudo-display name: %CURDISP, %CURSCROLL, %NEXTDISP,
       %NEXTOUTPUT, %NEXTPLOT, %NEXTSCROLL, %NEXTSOURCE

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