To access the computer software with the second computer system, the second computer system transmits a request for {HEAD ~ the software} to {TAIL ~ the first computer system} 
To access the computer software with the second computer system , the second computer system transmits a request for { HEAD ~ the software } to { TAIL ~ the first computer system }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL