The menu bar extends across the top of the main screen and contains pull-down menus. There is only one menu bar at the top of the screen; dont put menu bars in windows. The menu bar provides a consistent location where people can look for commands. Each application, including the Finder, has its own menu bar consisting of a few standard menus, application-specific menus, and menu extras.
The menu bar:
* Is always visible and available, except in circumstances such as during a slideshow (see discussion below)