Entering product keys with a deployment image

I am reading about imaging to deploy machines with Vista OS and several software packages. My concern though is how do I enter the product codes/license keys for each software if I have it imaged. I read the article by brian on using the BDD in Vista (free download) and that seems the best option for me. He mentioned the need to enter product codes in his article but didn’t talk about HOW to do it.

Any recommendations?