Rad,
Quote:
the vars will be evaluated before it is sent
Minor detail I overlooked. 
One could pull the %windir% from the remote registry.
Stephen,
Instead of setting proxy "per user" it could be set "per machine" which would make it easy to manipulate remotely with a central admin script instead of separate individual local scripts that students can reverse engineer and defeat.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.
