means for indicating the halting of the actuation of the plurality of {TAIL ~ assignable user actuated switches} or {HEAD ~ keys}; and 
means for indicating the halting of the actuation of the plurality of { TAIL ~ assignable user actuated switches } or { HEAD ~ keys } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH