9 computer hardware and software used in conjunction with point-of-purchase product information displays, namely, shelf end displays, centrally-controlled pricing displays used in conjunction with point-of-purchase displays, retail shelf display units used in conjunction with product information dispensers and point-of-purchase displays, including product promotional information displays incorporating one or more of liquid crystal displays, light emitting diode pixels, luminous matrix signs, and the like, incorporating displays of lettered or graphic messages