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