On May 14, 2010, at 3:18 AM, Jagdeep Singh wrote:

> Hi All!
> I am looking for a solution, I want a user to do a single Login only on a PC
> .
> E.g. If a User has logged on my website website.com in Internet explorer,
> then he cant login on same website in another browser like Firefox etc with
> same loginid or another.
> Can I trace MAC address of a single machine to solve this issue?
> Or is there a concept of GLOBAL COOKIE / Cross Browser Cookie which will
> work for all browsers in a single machine..
> I hope You will help me out
> Regards
> Jagdeep Singh
> +91 9988009272

If you store sessions in a MySQL table you could access that table to see if 
the user is still logged in and when the last time the session data was updated.

Take care,

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