1. Use Left/Right arrow keys to allow users to navigate within the navigation links. 2. Use Down arrow key to expand the submenu and up/down arrow keys to navigate within the submenu. 3. Use Enter/Space key to select the menu/submenu items. 4. Use Esc key to leave the submenu. 5. Use Home to select the first item in the menu and End to select the last item in the menu. 6. Use character keys to select the next item having a name that starts with the typed character.