Some full keyboard access shortcuts may be unavailable in some applications. Make sure you’re using the latest Mac OS X version of the application.

If the keyboard shortcut uses a function key and you’re using a portable computer, you must press the Control key first, and then press the Fn key and the function key.

In the Keyboard pane of Keyboard & Mouse preferences, you can select an option that lets you use the function keys for keyboard shortcuts without pressing the Fn key.