Magic?  Actually, you could use URL-rewriting or hidden forms, but anybody
using your page could change the value from "0" to "1" to fool your code
into thinking they'd logged on.  They could also do the same with a cookie
if they reverse engineered your cookie data (which is not hard).  Best to
use the Session object as that's stored server side, and, conveniently, goes
away when the user does.



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