In a preferred embodiment, the present invention comprises {TAIL ~ an authentication engine}, an authentication host, and {HEAD ~ a plurality} of providers coupled to the host, each provider implementing a selected authentication scheme 
In a preferred embodiment , the present invention comprises { TAIL ~ an authentication engine } , an authentication host , and { HEAD ~ a plurality } of providers coupled to the host , each provider implementing a selected authentication scheme
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH