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Term Definition

1) A logic element that blocks or passes a signal, depending on the status of specified input signals.
2) The control element of an SCR or of some other solid-state devices.


a special node that interfaces two or more dissimilar networks, providing protocol translation between the networks.

Group technology

a coding and classification system used in CAD for combining similar, often-used parts into families. This allows them to be retrieved, processed, and eventually fabricated, in an efficient, economical batch mode.


a type of software designed to raise the productivity of people working in groups and thought to have application in both engineering and production functions.


a Graphical User Interface is characterized by using windows, icons and menus.

Hand shaking

contact among or between CPUs for identification.


An interface procedure that is based on status/data signals that assure orderly data transfer as opposed to asynchronous exchange.


the physical, manufactured components of a computer system, such as the circuit boards, CRT, keyboard, and chassis.

Harmonic distortion

Continuous distortion of the normal sine wave, occurring at frequencies between 60 Hz and 3 kHz.


Describes an approach based on common sense rules and trial and error, rather than on comprehensive theory.

High-level language

A problem-oriented programming language in which each instruction may be equivalent to several machine-code instructions.


Human-machine interface


1) A central controlling computer in a network system.
2) Any device on a network system that provides a controlling function to another device on the network.
3) Any intelligent device for which another device is providing a communication interface to a network.

Host computer

the primary computer in a multi-processor network that issues commands, accesses the most important data, and is the most versatile processing element in the system.

Hot swap

exchange of components during operation.

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