{TAIL ~ The execution server} supervises prioritization and scheduling of test requests from all client machines in {HEAD ~ the communications test network} 
{ TAIL ~ The execution server } supervises prioritization and scheduling of test requests from all client machines in { HEAD ~ the communications test network }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD