If you have ever tried to access gmail, facebook, ... with two different browsers in a same computer you see that you can and if you sign out of one the other one is still signed in meanwhile you have the same IP Address(network layer of TCP/IP) on both browsers(application layer of TCP/IP).

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: Two PHP sessions, same IP address, active at the same time? Is it possible to have two sessions associated with the same IP address active at the same time?

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