Disabling multiple sessions

Hi all,
I am writing a simple web application. i have two very troubling requirements.
1- my users may be away for long times so i cannot timeout my session (time out is approx 30 mins).
2- if a specific user has logged in once then i should not allow the same user to log in from a different machine or browser window.
The problem is if the user that signed in first closes the browser window then the session will not time out because i want the session to be there for at least 30 minutes. and as that particular session id is still there i cannot allow the same user to sign back. anyone has any idea how to deal with this problem.
[i am using web sphere application server]

Many thanks,
here is a brief of what i did. I am maintaining a small hash table of my own. I am storing user name,machine IP pairs in the hash table. when a request comes in from a different IP than that of the previous one I deny login request. To sign in from some place else the user will have to properly sign out from the application or wait for the session to timeout.
Due to NATs and Proxys i couldnt get correct Ip address from HttpServletRequest so i used a javascript code to get IP of remote host locally and send it to server.
Still I could restrict access from another browser from same machine. One way of this could be to getRemotePort from HttpServletRequest but that way if the browser is closed than there is no way for user to sign back in unless the session times out.
[I have implemented a SessionListener that removes entries from my hash table whenever session times out or is invalidated]
Best Regards,
Faran

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