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

       /POP (default)
       /NOPOP

    Controls whether a specified display is placed at the top of the
    display pasteboard, ahead of any other displays but behind the
    PROMPT display. By default (/POP), the display is placed at the
    top of the pasteboard and hides any other displays that share the
    same region of the screen, except the PROMPT display.

    The /NOPOP qualifier preserves the order of all displays on the
    pasteboard (same as /NOPUSH).