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Organisations increasingly rely on information being processed and communicated, and whether the processing is undertaken by personal computers, mainframes, minicomputers, private automatic branch exchanges (PABXs) or voice messaging systems, the communication is invariably by means of a cable. And since organisations have always sought to undertake activities more efficiently — however they have variously described efficiency — the result is that systems, ideally, are used more continuously. Technologists are responding to the challenge of integrating systems.

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