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if you had the source code and knew the os interface very well this would probably no be too hard.
for instance if you wrote an app for your desktop pc and wanted to run it on your ppc, you would just update all the os calls in the ppc development environment (hopefully all your output to the screen was through the os) and rebuild.
add anything to this, or add problems, and everything gets more difficult, and will quickly become more difficult than rewriting the whole thing.
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