If you run Applications -> Utilities -> Activity Monitor, you will see that many Snow Leopard applications are already running as 64-bit apps, and this is with your kernel booted as a 32-bit kernel. If you have a 64-bit application it will be able to use more than 4GB of memory (if it wants to that is, and you happen to have the memory for it). You DO NOT need to boot into a 64-bit Mac OS X kernel to run 64-bit applications. With Mac OS X Snow Leopard (10.6), Most of the applications bundled with Snow Leopard have been built as 64-bit applciations, and RUN that way on both 32-bit and 64-bit Mac OS X kernels. A 32-bit Mac OS X kernel has been able to run 64-bit Applications since Mac OS X Leopard (10.5).
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