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

       /LOCK_STATE
       /NOLOCK_STATE (default)

    Controls how long the state set by /SET_STATE remains in effect
    after the specified key is pressed. The /LOCK_STATE qualifier
    causes the state to remain in effect until it is changed
    explicitly (for example, with a SET KEY/STATE command). The
    /NOLOCK_STATE qualifier causes the state to remain in effect
    only until the next terminator character is typed, or until the
    next defined function key is pressed.