visual c libraries: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt__strnicmp.2c_._wcsnicmp.2c_._mbsnicmp.asp
is in the Visual Studio .NET section, and similar errors almost surely exist
in C++ library documentation in other sections of MSDN.

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I think the return value of _wcsnicmp is an int not a wide-character string.
I think the return value of _mbsnicmp is an int not a multibyte-character
string.

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I think the text just needs "and return value" removing from it.

Have you reported it via the Contact Us link on that page?

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Yes.

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Sometimes I report things there. Actually in recent years the quality of
response from that procedure has improved somewhat, though it's still
inadequate. In the past there would often be replies blaming me and saying
I should read the documents, or apologizing for inconvenience but saying
it's not Microsoft's fault, or no reply at all. In recent years they have
indeed improved to admitting that there are errors, but saying that MSDN
content is acquired by MSDN so still unlikely to be fixed. Postings in MSDN
managed newsgroups usually get a higher quality of response.