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FilledSmallSquare$Packages gives a list of the contexts corresponding to all packages which have been loaded in your current Mathematica session.

FilledSmallSquare$Packages is updated when BeginPackage is executed.

FilledSmallSquare$Packages is used by Needs to determine whether a particular package needs to be loaded explicitly.

FilledSmallSquare See The Mathematica Book: Section 2.6.9.

FilledSmallSquare See also: Contexts, $ContextPath, DeclarePackage, $ExportFormats.