However, {HEAD ~ the authentication device} or method may also be used to authenticate {TAIL ~ a user} to the remote service, or indeed, mutually authenticate a remote service and a user 
However , { HEAD ~ the authentication device } or method may also be used to authenticate { TAIL ~ a user } to the remote service , or indeed , mutually authenticate a remote service and a user
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH