Hi HappyDigit,
First off: you don't need any code and I recommend against it. If you have code on InfoPath Form Server it will require an admin install, which is a pain and not worth the trouble if you can avoid it, which you can. However, for InfoPath 2007 and InfoPath Form Server - assuming you are running these as browser forms - you will want to create a UDC for them. Search the Microsoft Team Blog for UDC (see a link to their block under our Resources tab) and there's a good post there. I also have a document I can send you. David Airapetyan worked on Form Server and has lots of insights too if you have more trouble.
Patrick Halstead
Project Manager at Qdabra