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