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) Following IC chip integrates 100 thousands electronic components per chip

2) Which computer was considered the first electronic computer until 1973 when court invalidated the patent?

3) Floppy disks which are made from flexible plastic material are also called?

4) In which year was UK’s premier computing event called ?The which computer? started?

5) A technique used by codes to convert an analog signal into a digital bit stream is known as