The thingy goes in your computer and then you can open the file for the 30,000 eligible Al Khamsa horses for North America. I have bought 3 books so far but each has leaped out of my hands for presents and such before I could get a look. The one I bought finally at the EE was the last one we had down there and then someone at the end of the show wanted to buy one so I let it go. If Pat Lawrence hadn't popped the CD into her laptop during the EE I wouldn't even know how to answer your question.
Glad you like the book, Jeanne Craver and her faithful publications committee have truly done us proud. It is an amazing volume and I must say in the brief look I got at the advertising section, in color, the horses are amazing. Most ads are from small breeders so it is a gold mine of seldom promoted horses, excellent and a forever reference work for beginners as well as more serious students of the Al Khamsa horse.