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What are some of the lesser know, but important and useful features of Windows batch files?
Guidelines:
One feature per answer
Give both a short description of the feature and an example, not just a link to documentation
Limit answers to native funtionality, i.e., does not require additional software, like the Windows Resource Kit
Clarification: We refer here to scripts that are processed by cmd.exe, which is the default on WinNT variants.
(See also: Windows batch files: .bat vs .cmd?)
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