Helius, a interactive distance training company, made them for GM. It was used for training for service and sales at the dealerships before training was moved to the internet. But it is much more useful than the cable tv converter box you found in grandpa's attic.
It is a PC in a boring box. It has a 2MHz AMD processor, 1gb DDR memory, and a 120GB hard disk. To turn it into a Windows pc, boot an XP Pro installation CD from an external USB drive. After XP is running, you'll have to load the motherboard network drivers from the ASUS site.
I can post more information on that if it would be helpful.