Booting Windows on External Hard Drive

Is it possible to set up an external hard drive with one or more Windoze partitions so I can boot from them? If so, will the drive also boot a Windoze machine? Also, what is the oldest version that will work with a 2.2 GHz MB?
Message was edited by: MacInAction7

Windows does not boot from external drives.
For Boot Camp installations:
Windows XP Home Edition or Professional with Service Pack 2 or later, or Windows
Vista Home Basic, Home Premium, Business, or Ultimate
Important:
You must use a single full-install Windows installation disc (Service Pack 2 is required for Windows XP installations). Do not use an upgrade version of Windows and do not install an earlier version of Windows XP and attempt to update it later to SP2. Use only 32-bit versions of Windows.

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