This is documentation for Mathematica 4, which was
based on an earlier version of the Wolfram Language.
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$Echo$Output

$Messages

FilledSmallSquare$Messages gives the list of files and pipes to which message output is sent.

FilledSmallSquare Output from Message is always given on the $Messages channel.

FilledSmallSquare See The Mathematica Book: Section 2.13.1.

Further Examples

$Echo$Output