Well, I guess I could have put in the standard disclaimer about how none of this makes sense if you're dealing with client IP addresses that change (which they will for anyone behind an AOL firewall), session IDs that change, multiple servers (in which case you have to merge the log files then do your parsing), and so forth. But I presented my (simple) solution based on the trivial situation: stable IPs, a single server, no weirdness with the URL changing.

I'm guessing (or hoping, anyway) that anyone in a non-trivial situation is going to know about how to work around their situation to get the right answers.