If you’ve ever read a technical book, you’ve seen the acknowledgments and understand that even though there are (in this case) two names on the front cover, a lot of other folks behind the scenes make the whole process work. In particular, we’d like to single out Denise Santoro Lincoln, who was our primary wrangler. We gave her “polenta” of problems, which she handled with taste, grace, and humor. Thanks also to Clay Andres and Jeff LaMarche, who helped make sure we didn’t tell you any lies. Zillions of thanks to Laura Esterman, our production editor, for turning mere piles.