Does anyone know how to find out how many session variables are active on a web site? If so, can I specify a variable name?

Basically I want to set a session variable every time a user visits my web site so I can see how many active users are currently online.

There are many ways of accomplishing this. If all you want is a count then follow this tutorial:
http://www.asp101.com/resources/active_users.asp

Thanks Anacrusis.

The code at ASP101 worked great.