18Key DescriptionSwitches the touchscreen function off or on.*Switches the touchpad function off or on.Switches the system sound output off (mute) or on.Switches the display backlight off or on.Serves as the sleep button that you can define withWindows’ Power Options.TABLE NOTE: * means “select models only.”Windows KeysThe keyboard has two keys that perform Windows-specific functions:Windows Logo key and Application key.The Windows Logo key opens the Start menu and performs software-specific functions when used in combination with other keys. TheApplication key usually has the same effect as a right mouse click.