Abstract: In a first aspect, a system is provided for queuing people that are to use a bathroom. The system includes (1) a controller; (2) a monitoring device coupled to the controller and adapted to monitor occupancy of a bathroom; and (3) computer program code operative with the controller. The computer code is operative with the controller so as to allow the controller to (1) receive a request to use the bathroom from a user; (2) enter the user in a bathroom queue; and (3) notify the user when the user should proceed to the bathroom.

Abstract: A POS terminal unit is provided which automatically notifies an operator about the presence of a customer waiting to make a purchase when a salesclerk is absent from the POS terminal unit. When an approach sensor 1 detects the approach of a customer to the POS terminal unit, a signal is transmitted to a control portion through a first detecting portion 3 and a buzzer is activated. An ID card identification sensor 2 is a non-contact type sensor capable of receiving data of an ID card 8 located within a predetermined space range, and sends the data of the ID card owned by the operator to a second detecting portion. After confirming whether or not the data received by the second detecting portion agrees with the pre-registered ID data registered in an ID information registration portion 9, the data is sent to the control portion 5.