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) Main storage is also called

2) Who is credited with the idea of using punch cards to control patterns in a waving machine?

3) which of the following is problem oriented language?

4) IBM System/360 is

5) Which of the following file menu option saves document to disk?