Info About Mac OS X Needed

My understanding is that OS X is a 64-bit program. Right? If so, then does it run 32-bit programs in an emulation mode as does 64-bit Windows. What 64-bit programs are available for OS X? I know that the iLife programs that will come with Snow Leopard will be 64-bit.

The first understanding is that 64-bit Windows doesn't use "emulation" to run 32-bit code. The Intel and AMD 64-bit processors are full x86 (32-bit) processors, with 64-bit bolted on. Windows x64 is a 64-bit OS. When Windows x64 wants to run a 32-bit app, it simply sets up a 32-bit environment and shoves the 32-bit app into the x86 part of the CPU. The app runs, at native hardware speed, as if it was running on a regular 32-bit processor of the same speed.
That said, OS X 10.5 "basically" works in reverse. OS X 10.5 runs as 32-bit, but when an app wants to run as x64 (64-bit) OS X has a 64-bit framework set up in the x64 space and throws the 64-bit app in it. This is of course a very primitive explanation, and is just meant to give a general idea of what's going on. Snow Leopard (OS X 10.6) will be much more 64-bit.

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