The UP 503 is further configured to detect additional commands from {TAIL ~ the subscriber location} 105, such as {HEAD ~ rewind} , pause or fast forward commands, and if supported by the processor Pa 501 and if allowed according the corresponding user agreement, alters the data stream accordingly 
The UP 503 is further configured to detect additional commands from { TAIL ~ the subscriber location } 105 , such as { HEAD ~ rewind } , pause or fast forward commands , and if supported by the processor Pa 501 and if allowed according the corresponding user agreement , alters the data stream accordingly
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH