{TAIL ~ A system} 16 wherein {HEAD ~ the network} comprises a plurality of receiving units in communication with a server 
{ TAIL ~ A system } 16 wherein { HEAD ~ the network } comprises a plurality of receiving units in communication with a server
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH