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