A menubar is a bar at the top of a window that contains the menus for the application. An access key is an underlined letter in a menubar, menu, or dialog that you can use to perform an action. On a menubar, the access key for each menu is underlined.
To open a menu, hold the Alt key, then press the access key. In the menu, the access key for each menu item is underlined. To choose a menu item when a menu is displayed, you can simply press the access key for the menu item.
For example, to open a new window in the Help application, press Alt+F to open the File menu, then press N to activate the New Window menu item.
You can also use access keys to access elements in a dialog. In a dialog, one letter in most dialog elements is underlined. To access a particular dialog element, hold Alt, then press the access key.