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based on an earlier version of the Wolfram Language.
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WindowMovableWindowClickSelect

WindowFloating

FilledSmallSquareWindowFloating is an option for Notebook which specifies whether the window for the notebook should float on top of other windows when it is displayed on the screen.

FilledSmallSquareWindowFloating->True is often used for palettes.

FilledSmallSquare If there are several floating windows the most recently selected one goes on top.

FilledSmallSquare See The Mathematica Book: Section 2.10.2 and Section 2.10.13.

FilledSmallSquare See also: WindowClickSelect, Visible.

WindowMovableWindowClickSelect