Upgrade to new duo core macbook

Can anyone tell me if my software designed for my ibook G3 (or soft ware for the G4 for that matter) will run if I upgrade to the new macbook duo core??

Hi, and welcome to Apple Discussions.
That depends on what software you're talking about.
Anything that runs in Classic won't work. Most other applications should work through Rosetta (emulation for Power PC applications written for OS X).

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