Functionaliity to remeber the login page when user signs in the next time

Hi !
In my application i need to include the functionality to make the application remmeber the user name the second time the user logs into the application, very similar to when you sign in to Hotmail.com, your email address is stored when u login from your machine the second time. And the first time when you login, it asks you via a check box that whether you would like to remember your email address when you would login next.
It would be great if somebody to tell me the logic in Java?
i am using Struts, EJB and jsp.
thanks
SA

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