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