/sys$common/syshlp/helplib.hlb DEFINE, /KEY, Qualifiers, /ECHO  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /ECHO (default)
       /NOECHO

    Displays the equivalence string on your screen after the key
    has been pressed. You cannot use the /NOECHO qualifier with the
    /NOTERMINATE qualifier.