It's integrated with vb3 on a large site. The site runs the vb3 forums across multiple front-end load-balanced servers.
Only one server contains the PhotoPost Classifieds scripts because they're not designed for multi-server set-ups. The registration script is on a different server with a different subdomain.
My question is where can I change the code to accomplish my needs as stated in the first post? I want to point users to the correct subdomain, but where can I edit that code?