But what kids had to play with were PCs, and so that's what they wrote viruses for.

But in most countries, writing viruses is not illegal.

We've seen kids write viruses that delete other viruses.

Those who write viruses, and those who continue to do so into adulthood, tend to hold an immature point of view, she said.

Rather, she said, they appeared to write viruses for the intellectual challenge or to relieve boredom.

Virus writers could use the macros to write viruses embedded within documents.

And they are writing viruses for the systems they have.

Articles describing how to write viruses have appeared in several publications that are widely circulated within the underground.

Not content to mess with your desktop computer, hackers are now writing viruses for Palm devices.

Vicodin has been quite active lately, writing and distributing viruses through the Internet, experts said.