I use (and Love) Live 6 with 2 remote computers running Aarkaos plugged into projectors around the bar. Even better than wires though is a little IP over Ethernet app I've found called IPMIDI http://www.nerds.de/en/ipmidi.html, so the 3 laptops can be linked WIRELESSLY via a WiFi PAN.
Works great, very low latency and all FX run perfectly in time with the music I'm mixing, with no additional overhead on the DJ laptop. I've also found that setting up Follow Actions on my video (midi) clips works a treat as an "Autopilot" so you can focus on your DJ set....
Hope someone finds this useful
Using Ableton Live :: Mixing Audio and Visual
Even cooler..... NO WIRES!
Don't do anything I wouldn't do. But if you do, then name it after me!