Hacked, remote-controlled home computers, known as robots or "bots," and large groups of robot networks like the one 0x80 runs -- called "botnets" -- are the souped-up cyber engines driving nearly all criminal commerce on the Internet. Botnets are used to relay millions of pieces of junk e-mail, or spam, touting everything from cheap Viagra to get-rich-quick business schemes. And the botmasters who control these computer networks are at the heart of ominous and increasingly common online shakedowns known as "denial of service attacks."