ABSTRACT
Humans and computers are able to send and receive information in several different modes, termed input-output (IO) channels. ComputersIO channel send information on IO channels that are detectable by human senses (see “Human senses” inset, on the next page). Computers are equipped with devices to detect information sent by human users on similar IO channels. For example, a PC receives information from a human user primarily on the haptic IO channel (“haptic” means related to touch), via the keyboardhaptic and the mouse. In return, information is sent from the PC to its human user on the visual IO channel, via a VDU (visual display unit) or monitor.
