A strange question…

I have an ASP.NET application that is set for anonymous access, but I was wondering if there is still a way to find out which user is accessing the webpage even though it’s set to anonymous?

Its so that we can allow users access to the web pages without logging in, but we can also audit trail what they do by picking up there login credentials in some way.

I was looking at using their IP address as a route to finding out this info. Does anyone have any ideas?

(The IIS website is hosted on a Novell Network)

Thanks