GWT applications session management

Hi guys, i am a new to GWT applications to AJAX applications in
general. i am making sample applications, to learn GWT applications. I
am creating a very simple bank system -ok, by very simple i mean very
very simple- and i reached the part the authentication and
authorization logic is needed.

Can someone explain the authentication logic in GWT apps ?

Anyone explain the entire authentication and authorization logic in
Ajax application ?

Session management in Ajax applications ?

If you don't want to bother yourselves with explaining and code
writing any useful links will be fine.

Thank you very mush.

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