About login session timeout

When I am logged in here, and I don't do any activity for nearly 10 minutes, my login session timeouts automatically & I need to login again.

How is this controlled ? By some client side scripting ?? Is there any way I can increase this timeout duration ??

And Gmail does not timeout so soon.

What is this login session expiring funda, could someone explain ??

[Kiran.dks]

Just check in "Remember me" option while logging in.

Ok, thanks kiran.
But also I wanted to know the programming aspect of it. That means how this is controlled and why different sites have different durations for timeout.

[Kiran.dks]

Time out sessions are included due to security reasons. I know a code that can control this timeout session, but can't post them. That will be against the forum rules. All I would like to say is it's better you use "Remember me" option and "Log-out" while leaving. That would be much safe.

Humm....I'm getting the point slowly. Suppose i closed browser without logging out of Gmail , so for how much time it stays logged in ?

[ahref]

It is session cookie which stored the session variables, by programming we can set the expiring time of session cookies.

Oh, cookie, rite. Thanks.