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

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

کیا ضرورت ہے جب ایک ہی وقت میں ایک سے زیادہ شخص مرکزی کمپیوٹر استعمال کرتا ہے۔
Explanation

A terminal is required when more than one person uses a central computer at the same time.

The word "terminal" comes from early computer systems 

it is used to send commands to other computers and enter data 

it is an electronic or electromechanical hardware device