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

 screen mode is not supported on this terminal screen mode is not set

    Facility: DEBUG, VMS Debugger

    Explanation: Screen mode is not allowed on the terminal type used
    by the current session.

    User Action: Use another terminal if screen mode is desired