associating {HEAD ~ the lock} with {TAIL ~ another client session} and enable the feature instance to be updated in the another client session 
associating { HEAD ~ the lock } with { TAIL ~ another client session } and enable the feature instance to be updated in the another client session
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH