Prevent concurrent login for same user account

[kh99]

I don't know about that mod, but I'm curious why you want to do that. What I find is... Edit: the following is wrong...see posts below.

that if I log in to one browser (without "remember me"), then I log in to another browser, I do get logged out from the first session (although a guest session will be created as soon as I try to access the site). If I use "remember me" for both logins, then it does seem to create two sessions, which surprised me because I would have guessed that it would delete the first session when the second was created. But even if it did, I'd still have the illusion that I had remained logged in because of the "remember me". So I don't see what removing the session would accomplish.