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