Session Start & Session End

Question

Hi All,
       Does the Session_End event fire when a browser is closed? I am using Session_Start and Session_End to add and subtract from a counter. When a session starts it works fine. When a user closes the browser, the subtraction doesnt work. I am using the global.asax file to increment and decrement the count. Just that the End doesnt work. Any ideas?

Thanks & Regards
Vishwas