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