UI tip: In any window, double-click on the icon at the top left to close the window. This has existed since Windows 3 and persisted through 95, XP, 10, etc., b

UI tip: In any window, double-click on the icon at the top left to close the window. This has existed since Windows 3 and persisted through 95, XP, 10, etc., but not many people know about it. App windows that have custom chrome like Chrome, Firefox, etc. cannot use this trick, however.