Data Usage Tracking Apache

[attila@inet.com.au]

I need to track the data usage of every web request to a particular 
imp user?  Is there a way to do this? 

I have thought of two ideas. 

1. Can I use the imp login screen as some sort 
of .htaccess procedure to set the $REMOTE_USER 
variable in apache? 

2. Is there a way to ensure that a certain username 
is always on the end of the variable list in 
the url.  Some sort of $totalusr . "username=impuser". 

Thanks 

Attila