{TAIL ~ Portion} of data stream or data block 200 is sent from {HEAD ~ one or more clients}  
{ TAIL ~ Portion } of data stream or data block 200 is sent from { HEAD ~ one or more clients }
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH