Customer Rating: Summary: It is avaliable free on the Internet Comment: This book is a classic exposition on the programming of computer viruses. Although a bit outdated, it is free to download from the publisher's website http://www.ameaglepubs.com/free_virus.html (it requires you to register but that is free too) along with the first edition of the Giant Black Book of Computer Viruses and lots of other information (i.e. DON'T BUY THE OVERPRICED USED COPIES ON AMAZON.COM).