In particular, Windows 2000, NT and 7 - can we rely on fileno(*STDOUT) always being 1?

Yes. It is a standard C thing, not OS dependant.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^3: Testing whether a file handle is attached to STDOUT by BrowserUk
in thread Testing whether a file handle is attached to STDOUT by rovf

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