Kernel Startup Mode Selector
It shows whether you have a 32-bit or a 64-bit processor.
Well, actually Mac OS 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
- 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