Mac OS X, Emacs and Windows keyboard - remapping a key

Mac OS X, Emacs and Windows keyboard - remapping a key

I have a Windows keyboard (MS natural 4K), I'm using Mac OS X, and I like to use Emacs. However, the default Mac OS X GUI build for Emacs has the Windows key mapped to Meta (meta typically is the Alt key). This is not very comfortable, and I would like to remap it. Note that in the rest of my environment, Alt is really alt, and the Windows key typically shows up as the Apple key.