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