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

       /SET_STATE=state-name
       /NOSET_STATE

    Causes the specified state-name to be set when the key is
    pressed. The state-name can be any alphanumeric string.

    If you omit the /SET_STATE qualifier or if you use /NOSET_STATE,
    the current state that was locked remains in effect after you
    press the defined key. If you have not included this qualifier
    with a key definition, you can use the SET KEY command to change
    the current state.