What is required when more than one person uses a central computer at the same t

What is required when more than one person uses a central computer at the same time?

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1) The ALU of a computer responds to the commands coming from

2) One computer that is not considered a portable is

3) An input /output device at which data enters or leaves a computer system is

4) An output device that uses words or messages recorded on a magnetic medium to produce audio response is

5) Which of the following is not electro-mechanical computer?