{HEAD ~ The first receiving unit} streams {TAIL ~ the content} to the second receiving unit through the network 
streams
{ HEAD ~ The first receiving unit } streams { TAIL ~ the content } to the second receiving unit through the network
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH