Sorry for 're-opening', but what Archangel said is untrue.
On my banned account, I've been using that program before to bypass it. Now I'm using SteamLoader and I keep trying to join my friends party. Sometimes it'll join after a few times, sometimes it takes up to 30 minutes.
Anyway, combined with legends as HOUSE to Force Host, it's possible to play online. Console keeps saying it wants to kick me, but it's unable because I'm the host. Game also prints text messages in-game as "Cheat Detected".
Stupid part: I'm beeing kicked sometimes after a while and a new host is been picked.
Edit: just played again, but I wasn't host. So it took 10 secs to kick me.