] gives the notebook, if any, that contains the button which initiated the current evaluation.
ButtonNotebook returns a NotebookObject.
If a button in a palette initiates evaluation in another notebook, then ButtonNotebook[
] will be the palette, but EvaluationNotebook[
] will be the other notebook.
If the current evaluation was not initiated by a button, then ButtonNotebook[
] will return $Failed.
See the Mathematica book: Section 2.10.3.
See also: Notebooks, EvaluationNotebook, SelectedNotebook, InputNotebook.
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