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

    Marks the display as being removed from the display pasteboard,
    so it is not shown on the screen unless you explicitly request
    it with another DISPLAY command. Although a removed display is
    not visible on the screen, it still exists and its contents are
    preserved. You cannot remove the PROMPT display.