The intermediary device 43 can utilize non volatile memory connected to {TAIL ~ the external memory interface} 438 as {HEAD ~ buffer memory} 
The intermediary device 43 can utilize non volatile memory connected to { TAIL ~ the external memory interface } 438 as { HEAD ~ buffer memory }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD