How to Restrict same portal user from other node

Hi
In my application, we charge customers for each portal user logins. But, i found that, they can share same user logins amongs number of people.
I don't want to allow the same portal user login into the application if that user is already logged in and it's session is still active.
Here is the Scenario :
User A is logged in to the portal from terminal AA. Now, User A agin tries to logg in to the portal from terminal BB. I don't wnat to allow user A to log in from terminal BB bcuz user A has active session from terminal AA.
Can anyone know how to implement this??
thanks in advance.
Srini

Hi Srini!
We have solved this problem with our own login portlet. Before the final login we've got to check (from the certain table) how many logins there are currently with that username.
But there is a problem. If the user closes the browser without logoff, the session remains active. There is a cleanup job, which removes those session in some hours. Still it is not very elegant.
Regards,
Jari

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