Techgage explains how you can run Sega Dreamcast classics on your PC with nullDC, you can read it over here.
Want to play your Sega Dreamcast games but don't want to haul the console out of the closet? You're in luck, because there exists an outstanding emulator that I recently became addicted to: nullDC. This article covers all you need to know about it, including how to get started. So what are you waiting for? SoulCalibur is waiting.