0-9 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
1. In automated systems, such as computer, communications, and control systems, the input, output, display, and processing equipment that provides the operator-system interface. 2. A configuration of input, output, display, and processing equipment that constitutes a stand-alone system not requiring external access.