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grants access to whatever data and functionalities are defined to be session-based.

What is usually done is: From your question, I suppose that you would like the browser "closure" to act like a logout button.

Let us now discuss a few options to maintain the session between the Web Client and the Web Server − A webserver can assign a unique session ID as a cookie to each web client and for subsequent requests from the client they can be recognized using the received cookie.

This may not be an effective way as the browser at times does not support a cookie.

It is not recommended to use this procedure to maintain the sessions.

A web server can send a hidden HTML form field along with a unique session ID as follows − This entry means that, when the form is submitted, the specified name and value are automatically included in the GET or the POST data.

The method will be called by the servlet container whenever an existing session is invalidated.Each time the web browser sends the request back, the session_id value can be used to keep the track of different web browsers.This can be an effective way of keeping track of the session but clicking on a regular () hypertext link does not result in a form submission, so hidden form fields also cannot support general session tracking.Either way, it is up to the server to enforce a timeout.You cannot reliably handle it client-side only, if only because the client can disappear abruptly without any trace (user's laptop battery is empty, user is roaming in a car/train and goes out of range of a station, user's machine or browser crashes, user is evil and kills his browser just to annoy you... What if we don't keep the session at the server side?What can be an alternative solution to invalidate a user session on browser closure ?