This is documentation for Mathematica 3, which was
based on an earlier version of the Wolfram Language.
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▪ Palettes lists currently available palettes.
▪ Palette files are kept in SystemFiles/FrontEnd/Palettes. Palette files added to this subdirectory will be listed in the menu when you restart Mathematica.
▪ See the Mathematica book: Section 1.3.6.