Peers that have not opened {TAIL ~ the pipe} may not receive or send any messages on {HEAD ~ that pipe} 
Peers that have not opened { TAIL ~ the pipe } may not receive or send any messages on { HEAD ~ that pipe }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD