What's the best way to see if a particular platform supports fork?  I
know I could check if it's running on Windows, but I'd like something
more direct (and presumably accurate).

A similar question: assuming a standard Ruby install (that is, no
popen4), what's the most robust way of running a shell command and
capturing STDOUT and STDERR?
`command 2>&1` seems to not always work on Windows.

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