More common is to set a cookie or something similar with
a unique code you generate when they log in and compare against your log... maybe even
have it change every once in a while or every page, depending
on your wish for secure-ness. Also good to expire the code
after a certain amount of non-use...
of course, your way would work in most cases. Except for many users behind a firewall
showing the same ip, maybe... it would work, but it's not the preferred way.
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