access menus in Mac OS X via keyboard

To access the top menus in Mac OS X via keyboard use the following
shortcut to select the first menu entry (the Apple logo):

* Control-Fn-F2 if you use F1, F2, etc. as system control keys
(brightness, etc.)

* Control-F2 if you use F1, F2, etc. as standard function keys.

Then you can use the arrow keys and enter to select a certain menu item.