Some years ago (read a decade or two) there was portable three screen workstations around. It pretty much was a high-end desktop computer with one side slightly larger than a 17 inch screen and two screens folding over it, pretty much looking like how the screens are arranged above. There was a non-keypad keyboard that was attached to the box when it was transported. Lets just say it was prohibitively expensive.
A quick Google image search for "
three screen portable workstation" reveals there still are such workstations around.
Could they be the perfect flight simulator LAN-party computers... Edit: I understand what you meant a bit better now. Aparently it is still a prototype. I just found this video from Tested.com on YouTube:
Razer's "Project Valerie" 3-Screen Gaming Laptop Prototype! (7 min, though a bit "noisy")