WindowClickSelect

WindowClickSelect is an option for notebooks that determines if the window for the notebook should become selected if you click it.

With the default setting WindowClickSelect True, clicking anywhere in the window for a notebook makes that notebook the currently selected one.

With the setting WindowClickSelect False, a notebook does not become selected when you click in the content area of the window. This property is often used in palettes so that clicking a button in the palette does not change the currently selected notebook. Clicking on the title bar or window frame will still cause the window to become selected.

See The Mathematica Book: Section 2.11.13.

See also: WindowFloating, SetSelectedNotebook.