Ah yes - I hadn't realised that it would create a loop but I see why now.
I'm not sure that using php to output files will work in my circumstances.
Yes I have access to httpd.conf but this is not something that I have touched before, what's your idea?
I am thinking that there must be some other way that I can transmit information from the tracking script to .htaccess simply. Would it be possible for instance to set some form of HTTP header information? I am thinking that I could "borrow" something like HTTP FORWARDED FOR or similar to pass information in a form that mod-rewrite can access. This is not something that I have researched, just bouncing ideas around out load at the moment.
Allan