[docs] [issue12954] Multiprocessing logging under Windows

[paul j3]

paul j3 added the comment:

I had noticed the `global _log_to_stderr` in `util.log_to_stderr()`, but hadn't taken time to track down where it is used.

Not only is it passed from the 'util' module to the 'forking' one, but it is also passed via a piped pickle from parent to child process.

There's a lot more to simulating 'os.fork' in Windows than I would have guessed.

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