This book wouldn't be possible without the tireless efforts of programmers all around the world, making great open source software. I'd name a few but would certainly leave too many out. Thanks for your great software! I'd like to thank my business partner, Glenn Kramer, for assisting with proofing this book (as well as minding the business while I was busy trying to make deadlines) and my Nessus Command Center (NCC) project mates, Brian Credeur, Lorell Hathcock, and Matt Sisk. Finally, my love and gratitude goes to my lovely wife, Cynthia, and daughters, Carina and Alanna, who sacrificed countless hours without husband and daddy to make this book happen.