[JoeH]

I've been curious about this as well, I found this post by a guy who gave a few details: http://crustea.vjfrance.com/article-21479794.html

  Tech specs:
  Here are a few few technical details, the biggest mapping I've ever done so far.
  * 6 * 20 000 lumens projectors, to project on the 160m x 10m facade.
  * We'll use high res visuals: 1024x768 on each projector, so the output image is 6144x768.
  * To stream such High res format, we'll have 2 "killer" media servers, to run very large video files.
  * We'll use the VJ software Arkaos 3.6 to control the video, with multi output and Midi support, we'll be able to synchronize the visuals together and stream Gigabytes of video very smoothly.
  * VVVV will be used to sequence and root midi MIDI signals between computers.

Edit: formatting