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