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

       /LINE_EDITING
       /NOLINE_EDITING

    Controls whether advanced line-editing features are enabled for
    editing command lines: pressing Return and pressing Ctrl/Z are
    recognized as line terminators, as are escape sequences.