<P> There is only one menu bar, so the application menus displayed are those of the application that is currently focused . Therefore, for example, if the System Preferences application is focused, its menus are in the menu bar, and if the user clicks on the Desktop which is a part of the Finder application, the menu bar will then display the Finder menus . </P> <P> Apple experiments in GUI design for the Lisa project initially used multiple menu bars anchored to the bottom of windows, but this was quickly dropped in favor of the current arrangement, as it proved slower to use (in accordance with Fitts's law). The idea of separate menus in each window or document was later implemented in Microsoft Windows and is the default representation in most Linux desktop environments . </P> <P> Even before the advent of the Macintosh, the universal graphical menu bar appeared in the Apple Lisa in 1983 . It has been a feature of all versions of the Classic Mac OS since the first Macintosh was released in 1984, and is still used today in macOS . </P> <P> The menu bar in Microsoft Windows is usually anchored to the top of a window under the title bar; therefore, there can be many menu bars on screen at one time . Menus in the menu bar can be accessed through shortcuts involving the Alt key and the mnemonic letter that appears underlined in the menu title . Additionally, pressing Alt or F10 brings the focus on the first menu of the menu bar . </P>

Describe the various options available in the main menu bar of ms word