{HEAD ~ A user} interacts with Client 124 via Controller 128, for instance, to select {TAIL ~ different hyperlinked Web pages} 
{ HEAD ~ A user } interacts with Client 124 via Controller 128 , for instance , to select { TAIL ~ different hyperlinked Web pages }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL