The viewer may also include memory into which {HEAD ~ a file} or files are downloaded for {TAIL ~ subsequent viewing} 
The viewer may also include memory into which { HEAD ~ a file } or files are downloaded for { TAIL ~ subsequent viewing }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL