Once a computer has been infested, it waits for orders from criminal bot herders, who turn these zombie computers into massive bot networks that spew spam and other malware across the Internet.

You may not be able to block the botnet invasion completely, but with layers of bot-hunting technologies and common sense, you can minimize the effect on your network. <A HREF="http://www.pcworld.com/businesscenter/article/137797/attack_of_the_killer_bots.html">Before you can battle the bots, you've got to understand the scope of the problem.</A>