Ahh... yes... In the past... a few of them...
With browser interfaces, a user idling around won't** be holding a connection open. They will be holding a session, but that's implemented using separate connections, and a COOKIE usually is used to associate the connections together into the session.
No different to any other website in that respect really...
H
** Shouldn't! Although I have seen some really awful code in the past that made requests and expected a browser to sit & spin for 30+ minutes and wait for a response... I could rant for a while about bits like that... But will save it for a time when people buy me a pint...