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FilledSmallSquareNotebookRead[notebook] gives the expression corresponding to the current selection in the specified notebook object.

FilledSmallSquareNotebookRead is the basic way to get into the kernel pieces of notebooks that are being manipulated by the front end.

FilledSmallSquare See The Mathematica Book: Section 2.10.3.

FilledSmallSquare See also: Get, NotebookWrite, NotebookDelete, ButtonSource.