This is documentation for Mathematica 5, which was
based on an earlier version of the Wolfram Language.
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Documentation / Mathematica / Front End / Menu Commands / Help Menu /

Help Browser...

FilledSmallSquare Help Browser opens the Mathematica Help Browser.

FilledSmallSquare The Help Browser lets you access a wide range of notebooks and other material to get help while you are using Mathematica.

FilledSmallSquare See The Mathematica Book: Section 1.3.8 and Section 1.3.9.