to return to the previous menu screen. to quickly return to the main menu.
or 
to scroll through lists or menus. or to scroll faster.
to see a context-based menu of options for the current screen.On-screen buttons allow you to navigate the pages, menus, and menu options on your device.
to return to the previous menu screen. to quickly return to the main menu. or to scroll through lists or menus. or to scroll faster. to see a context-based menu of options for the current screen.