Disclosed herein is a system and method for controlling divided screens, on which applications corresponding to input signals received from input devices are executed, independently through mapping with the input devices of different input types. The seat is adjustable between a first position where the child is retained in a reclined or semi-reclined orientation, and a second position where the child is retained in an orientation that permits them to sit and stand. In particular, the invention prevents the formation of a vapor lock when water is being drawn into a chamber that would prevent the subsequent discharge or spraying of the liquid. Another operation provides a polishing belt below the wafer head, and provides below the polishing belt a platen having a second active retaining ring capable of extension and retraction. When the cap is re-secured to the nozzle, the opening of the cap enables the viscous food substance to dispense therefrom at a second thickness that is less than the first thickness.