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

    Specifies the current display (screen mode). This is the display
    most recently referenced with a DISPLAY command (that is, the
    least occluded display.)

    Example:

    DBG> SELECT/SCROLL %CURDISP