Preferably, the system includes a transaction interface associated with {HEAD ~ the control system} for carrying out {TAIL ~ a current transaction} 
Preferably , the system includes a transaction interface associated with { HEAD ~ the control system } for carrying out { TAIL ~ a current transaction }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL