User should not be allowed to login 2 times to an application from same m/c

Hi Everyone,
I have to find all possible solutions to below problem:
Problem: User should not be allowed to login 2 times to an application from same machine.
Steps to produce the problem:
1) User 1 logins to application.
2) User 1 tries to login with different credentials from same machine.
3) User 1 should be presented with a message that he cannot login from same machine using 2 browsers.
4) User 2 tries to login to application with credentials of user 1. System should now display an alert to both users on System 1 and System 2 of this conflict.
Please share your thoughts regarding above problem.
Thank you
Edited by: rishab.garg on Feb 25, 2009 10:53 PM

When a user logs in to application flag it in database. Irrespective of client machine and browser when another user tries to login using same user id you will be able to identify that easily using stored flag against the user id.
If you want to distinguish between client machine for displaying different messages you can easily do this by comparing client IP address. To obtain client IP address use:
request.getRemoteAddr();Note that getRemoteAddr() might return last proxy machine's IP address (in case proxy is used) instead of client's machine. In that case you may consider using cookie (though using cookie is not a great idea).
Thanks,
Mrityunjoy
Edited by: mrityunjoy on 28 Feb, 2009 11:43 PM

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