sharepoint 2007 login/logout statistics

I want to track my employee in/out time within sharepoint. Here is what i want to do

Employee will singin on Sharepoint 开发者_JAVA技巧when they in and logout (could be singin evening once again) when they leaving.

I want to capture their login and logout timing on sharepoint context using some simple method. I read audit loging section but it contains more info.

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Well, as SharePoint sessions are really stateless this will be difficult to track, especially on multi server farms. E.g. What do you consider a log-off event, what if the user just closes the browser?

I actually implemented this in a commercial product that builds on top of the Audit log to determine when users have logged-on or off. It works really well, but it may be overkill for what you need.

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Perhaps SharePoint Usage tracking keep that kind of information?

If not, maybe a custom HttpHandler could be of use.