actually you do not need to "run bootcamp"... if you have a seperate HD or a partition, simply restart using your Vista/XP install disk, format the HD you want to use, and tada... the Bootcamp driver can be installed once you have setup your Windows, so you insert Leopard CD and the installer will load itself. It is actually used to setup the Ethernet and Sound drivers, nothing else... or you have specific keyboards and some other things on your Mac. You can also restart from Windows to Leopard then...
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hum, btw, what about the PC version of the Mac-OS, Darwin installed on a PC... never tested... someone played with it?... i know it's more like a Gnome or another Linux interface, so it do not render the usability of the Mac-OS, but i suppose it can be fun to play with..