| API | Application Programming Interface |
| AVKON | S60 extensions and modifications to Uikon and other parts of the Symbian OS application framework. |
| Navigation pane | Display information about the current state and view, and to help the user navigate in the application. |
| Decorator | Decorator contains navigation pane controls. |
| Control stack | Control stack holds decorator object. The topmost decorator is displayed on the navigation pane. |