Fiola remained oblivious to the tampering because the bot operators made sure they didn't slow down the computer too much by consuming lots of memory.

But Fiola's computer lacked adequate virus protection-the software he used wasn't functioning properly-so he could not have detected the activity on his own.

THE little red-tiled complex outside the Greek village of Filakio is not much to look at. But stand next to the fence and arms start to wave through the bars.