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