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