The system also includes a first receiving unit of the plurality of receiving units that is selected by the network to record {TAIL ~ content} corresponding to the request in {HEAD ~ a first memory} and storing the content in a first memory of the first receiving unit 
The system also includes a first receiving unit of the plurality of receiving units that is selected by the network to record { TAIL ~ content } corresponding to the request in { HEAD ~ a first memory } and storing the content in a first memory of the first receiving unit
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH