Episode 1 is controlled by an operating system called XINA. XINA is unique in it's command structure (ordinary UNIX / DOS commands do not work). A total of 99 XINA commands are available to view, alter, and execute the parameters surrounding the game.
XINA is actually an application layer on top of PC-XINU, a multithreaded operating system originally created by Douglas Comer. The legal guys at Williams felt that this was the better choice over Linux because they didn't have to share. More info is available http://www.pinrepair.com/pin2000/xina.htm. The license was purchased by some awad ausie that is keeping a tight lid on most of the Williams products he holds the rights to. He has promised the reproduction of some of the standard parts but asks an arm and a leg. If and when he ever comes up with a "Prism card" he wants 1400 bucks for it. Enough said.