OS is only on the disc. (Score 2)

Very interesting. I do have (and use) the WinCe SDK, reading through the CE Builder SDK info the DreamCast is referenced a few times. The hardware OS is boot from GDRom only, all directX D3D, internet, etc.. is all disc specific. While possible it could be a back door, from a developer viewpoint its probably unlikly to be anything interesting.. as well as vendor and developer specific.