VMS Help DEFINE, /KEY, Qualifiers, /SET_STATE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /SET_STATE=state-name
       /NOSET_STATE (default)

    Causes the specified state-name to be set when the key is
    pressed. (By default, the current locked state is reset when
    the key is pressed.) If you have not included this qualifier with
    a key definition, you can use the SET KEY command to change the
    current state. The state name can be any alphanumeric string;
    specify the state as a character string enclosed in quotation
    marks.