This is documentation for Mathematica 4, which was
based on an earlier version of the Wolfram Language.
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FilledSmallSquare$Urgent gives the list of files and pipes to which urgent output from Mathematica is sent.

FilledSmallSquare Urgent output includes input prompts, and results from ?name information requests.

FilledSmallSquare See The Mathematica Book: Section 2.13.1.