Viruses turn to peer-to-peer nets

Virus writers are setting up peer-to-peer networks to help their malicious creations spread. The networks are being used to control thousands of innocent PCs that some virus programs have infected. The tactic is being used because peer-to-peer networks are hard to disrupt, making viruses using this technique hard to stop spreading. Security experts say peer-to-peer networks are likely to become more and more popular with virus writers.