Is it possible to boot windows solely from an external hard drive so that it does not affect the internal drive

Is it possible to boot windows solely from an external hard drive so that it does not affect the internal drive. I already know that you can partition the internal hard drive to do the very same. Idon't want to use any of the internal space to run windows so I'm asking if it is possible to use a flash drive or external drive through USB to run windows when it is plugged in.

Read https://discussions.apple.com/thread/5043762?start=0&tstart=0 to discover you can't do it.
Allan

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