An access key is an underlined letter in a menubar, menu, or a dialog that you can use to perform an action.
To open a menu, hold the Alt key, and then press the access key. To choose a menu item when a menu is displayed, you can 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, and then press N to activate the New Window menu item. You can also use access keys to access elements in a dialog. To access a particular dialog element, hold the Alt key, and then press the access key.