How can i kick first Logged user?

[eluser]jedd[/eluser]
Yup, that's the approach I'd take if you want to limit concurrent logins to 1 - give 'em a hash in the cookie (gosh that sounds like something from college) at authentication time, stick it in the session, save it to a db table, and check it on each page load. De-authenticate the user if it doesn't match.