Active is an option for ButtonBox, Cell and Notebook which specifies whether a button should be active.
With Active->False the contents of a button can be edited.
With Active->True a button will perform an action when it is clicked.
Active cells are indicated by an A in their cell bracket.
See The Mathematica Book: Section 2.8.10, Section 2.10.6 and Section 2.10.9.
See also: ButtonStyle, Evaluator.
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