Is this legal?

[dachord]

I've played in a few live ring games in which this one guy has always lost terribly to me. Saw him out at a local bar one night and we struck up a conversation. I'd had a few beers and basically told him his playing skills were lacking. He smiled and asked if I played online poker (I don't). He proceeded to tell me that he has developed a method for winning big. He's a computer geek and is a sysop at a local company. He has over thirty computers at home that he plays online poker with. According to him, he signs on as 4 or 5 different players at a time under different accounts, and all of the "players" will play at one 8 handed table. Ergo, collusion with a twist. When he can see 4 hands at once, he's able to work it so one of his identities wins big. So - is this legal? Is it commonplace?