<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 in Mac OS X . </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> <P> KDE and GNOME allow users to turn Macintosh - style and Windows - style menu bars on and off . KDE can have both types in use at the same time . </P>

Explain the menus in the menu bar of an excel