s, devices such as fax machines or pagers are also suitable interface devices. [0055] Referring now to FIG. 3, there is described seller system 300 which includes central processing unit (CPU) 305, RAM 315, ROM 320, communication port 340, modem 350, and data storage device 360. [0056] Modem 350 may not require high-speed data transfer if most seller responses 120 produced are text-based and not t