32- or 64-bit Kernel Startup Mode Selector for Mac Set the kernel's startup mode.
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32- or 64-bit Kernel Startup Mode Selector for Mac Description

MacOS X 10.6 Snow Leopard is 64-bit - or is it?. Well, actually MacOS X 10.6 Snow Leopard is both 32-bit and 64-bit, and what that means for you depends on both your hardware and your settings. I put up an accompanying 0 website which should answer most of your questions at What does this app do? it shows whether you have a 32-bit or a 64-bit processor it shows whether you have a 32-bit or a 64-bit EFI it shows whether the MacOS X Kernel is set to boot in 32-bit or in 64-bit mode it shows whether the MacOS X Kernel is running in 32-bit or in 64-bit mode it shows whether Apple officially supports booting a 64-bit kernel on your Mac it allows you to select whether you want to start the MacOS X Kernel in 32-bit or in 64-bit mode (the setting might be ignored on MacBooks, depending on how Apple implements the restriction) accompanying webpage explains what the whole commotion about 32-bit and 64-bit in MacOS X Snow Leopard is about

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