Hi Yasin,
For maintaing Session you can use getValue and putValue methods, Its very simplet either you can URL Rewriting method for handling sessions

I assume that you mean that you want to maintain a session across multiple browser instances. One way to do this is to place a persistent cookie on the client, and then match this cookie with a session on the server. You will probably need to do this yourself, as most of the common servlet containers use cookies which are not shared across browser instances.