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

       /ECHO
       /NOECHO

    Specifies whether the command line is visible on the screen after
    you press the defined key. You cannot define a key specifying
    both the /NOECHO and /NOTERMINATE qualifiers. The default
    qualifier is /ECHO.