A menu consists of a menu bar, submenus and menu items.
A menu item can be either a first-level item (menu title) such as Object and Edit in the above example, or a subordinate item (menu option) as are all the other items in the example. A submenu can belong to a menu title or to a menu option--for example the menu option Preferences has its own submenu.
2.12.4 A Few Things to Remember about Keyboard Access
2.12.5 Writing the Menu Events
