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Grub won't help out WinXP to recognise EFI... Windows surely still use some real mode BIOS call during the boot process. I guess you'll have more chance by writting a plugin for the EFI that emulate a BIOS.
EFI is greatly extensible, but still I would have like it to create a revolution and to permit low-level driver, so we could have wrote code like used to do in real mode but directly in protected mode...
A question? Are the Mactel booting in protected mode? This would be awesome. If so I want one