How to find out how many concurrent users using web application?

Hi all,
I have a web application deployed using 9iAS. I am trying to find out how to find out how many concurrent users are using this application at any one time. According to Oracle there is no way to see this information using the enterprise manager interface.
Does anybody out there know how I can find out this information in real time? Failing that, are there any good analysis tools out there that display usage to the minute (all the tools I have found show usage by hour which is not sufficent for my needs).
Any help would be much appreciated,
Caroline

I know I haven't heard of any software to do this, but this also sounds like a really hard problem to try and really analyze well.
The trick is, you might "infer" how long a user is using an application based on when cookies are set and when they're set to expire. If that's a long time, though, that could count far more "concurrent" users than are actually there. A user could simply close the application at any time and stop using the application; you can't really detect that because the server isn't "told" when the user closes their browser or goes somewhere else.
A good perl script might be able to read the Apache access log and tell you how many unique IPs asked for a given directory in which various applications are stored in any 5 minute span of time... that could be something like an indicator of "concurrent" users.
If you don't know Perl, I'd suggest getting the O'Reilly & Associates book on Perl and learning it, because the more I think about this, the more this sounds like a textbook example for applying a Perl script.

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