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) Reading data is performed in magnetic disk by

2) Which operation is not performed by computer

3) Multi user systems provided cost savings for small business because they use a single processing unit to link several

4) Which programming languages are classified as low level languages?

5) When was Pascaline invented?