I was amazed when I finished scanning this book today. Quite frankly, I can't imagine why it was ever published! Aside from the fact that it was published this year (2002), and aside from the fact that the author appears to have used a Windows 95 machine to do his tinkering (I won't even give the author the respect of using the word "hacking"), this book is riddled with misinformation, inconsistencies, and uncommented source code (which incidentally only compiles, according to the author, on a version of *nix that very few people use). Any hobbyist with more than one year of experience knows AT LEAST what's covered in this book, and they probably don't even realize it! This book doesn't cover ANY of the new operating systems, doesn't take into account ANY basic security precautions that have been in use for a couple years now, and does the reader a disservice by trying to explain (poorly) what "hacker" and "cracker" means (clearly the author was trying to impress his friends with his knowledge of jargon). There are MANY more useful tomes on the market; don't waste your money on this book! The single most useful piece of information this book contains is a single page where the URLs to SART and (I believe) CERT can be found!