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