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Jim Leinbach, of H&W Computer Systems, wrote a 2-part article for NASPA's
Tech Support magazine January 2001. Part 1 describes session cookies as your
answer and can be viewed/downloaded at http://www.naspa.com/PDF/2001/0101%20PDF/T0101001.pdf .
Part 2 is at http://www.naspa.com/PDF/2001/0201%20PDF/T0102003.pdf .
From my reading of the article "session cookies" might be just what you
want. Basically, the analyzer can verify credentials initially and send back
a token to be used as a session cookie which doesn't have to be stored on
PC. You still have the problem of someone logging on then leaving while
session still active only to have one of those durn interlopers sit down.
Specialized peripherals like the Logitech Optical Whoopee Cushion can detect
that security breach but ... {smile}
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