Hi all,
i am trying to log the users using my system. presently i am just tracking concurrency of how many users there are. as a user logs on it increments a value in a table by one and when they log off it decrements it. my only problem is of course, what happens if the client crashes and the decrement isn't sent to the table. how do i know how many in the table are actually active users? how should i handle this?

thanks
Jordan :)