I Think It's Illegal

Most likely, you've heard of a little computer application called Gametap. It's a windows application. There's a Mac version coming soon, but it's likely that it won't have the same games.

Defcon 5: Windows applications are compiled binaries and could do anything imaginable to your computer.

There's some support for some console games, which use different archetectures.

Defcon 4: In order for a computer to run programs that are compiled for another archetectures, it either needs to run an emulator or the program needs to be recompiled. Programs are usually made with procesor-specific instructions, so there is bound to be errors when porting. Let me remind you that the first virus was made accidently from bad programming.

Defcon 3: Emulators tend to be copyrighted and so do the games.

It even has some Dreamcast Games.

Defcon 2: The Dreamcast was recent enough for the patents to be in effect. There's a somewhat bigger lecal issue with patent infringment.

The website says that "it just rocks."

Defcon 1: They don't even want to tell you how their program works: not even on the page labled "How it works."