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FilledSmallSquareVisible is an option for Notebook which specifies whether the notebook should be explicitly displayed on the screen.

FilledSmallSquare With Visible->False a notebook can still be manipulated from the kernel, but will not explicitly be displayed on the screen.

FilledSmallSquareNotebookCreate[Visible->False] creates a new invisible window.

FilledSmallSquare See The Mathematica Book: Section 2.10.13.

FilledSmallSquare See also: Selectable, WindowFloating, CellOpen.