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that is very well written, I would add though, that setx changes the registry
– barlop
Commented May 19, 2015 at 15:24
1

It's actually even less simple than described here. There are "volatile" environment variables to be mindful of. And, under some circumstances, the list of variables shown by the SET command will differ depending on whether the user has invoked an "elevated" command prompt or not.
– kreemoweet
Commented Jun 21, 2017 at 18:27

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