It also enables users, remotely located across one or more circuit switched networks, to access services offered by {HEAD ~ one or more machines} situated on {TAIL ~ one or more heterogeneous local networks} 
situated on
It also enables users , remotely located across one or more circuit switched networks , to access services offered by { HEAD ~ one or more machines } situated on { TAIL ~ one or more heterogeneous local networks }
OTH 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 HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL