[ubuntu] How to boot directly into a specific program?

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http://ubuntuforums.org – I have an old laptop that I wish to make into a dedicated Atari ST emulation machine. I have an emulator lined up, but I'm having trouble figuring out how to get the machine to boot directly into it. I don't want a window manager at all, the emulator runs without one. The emulator that I want to use is Hatari, which works with SDL. Ideally, I would like the machine to boot directly into Hatari, and shut down when I select 'quit' in the hatari menu.. I would have thought that this would be ridiculously simple, but I don't seem to be able to find a way to do it simply and without ru (Hardware)