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