Finally there is an emulator for Dreamcast games for Windows which will run SEGA commercial games.
It works with plug-ins and runs both with Direct3D and Open GL, supports MMU and SH4 Dynarec, VMS manager, and is operational for a Dreamcast keyboard, TPU speed adjusting, support for savestats 10 slots, etc.
To know which games are compatible you should visit the suthor`s website.