The invention provides a system and method for automatically displaying a user’s logged-in status across an Internet based network of affiliated Web sites via a visual indicator such as a toolbar to help the user to be certain about his logged-in status when he stays with one or switches from one to another affiliated Web site. A subnet proxy discovers printers on one or more subnets of a network and advertises print services. Each of the unit pixel areas includes a readout circuit connected to a corresponding pair of column lines, and first and second photo-electric conversion devices sharing the readout circuit. The first and second communication devices simultaneously: drive an output data signal upon the transmission line during a first portion of a period of the clock signal, and receive an input signal from the transmission line during a remainder of the period of the clock signal. The supply and drain channels each are inclined to the electrolyte channel. Specifically, the systems and methods for influencing shoppers may occur during a shopper’s first moment of truth by transmitting through a communication network one or more influential messages to a handheld wireless electronic device or intelligent shopping cart, which is in close proximity to a shopper during a shopping trip throughout a retail establishment.