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