In one embodiment, {TAIL ~ messages} may be sent only to the one or more endpoints bound to {HEAD ~ the pipe} 
In one embodiment , { TAIL ~ messages } may be sent only to the one or more endpoints bound to { HEAD ~ the pipe }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD