Computer Basic Information
The essential difference between an operating system like Linux and one like Windows is that

Linux is proprietary, whereas Windows is not.
any programmer can modify Linux code, which is not permitted with Windows.
there are multiple versions of Linux, but only one version of Windows.
None of these
Windows can run with an Intel processor, whereas Linux cannot.

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Computer Basic Information
What is output ?

What the processor gets from the user
What the user gives to the processor
What the processor gives to the user
What the processor takes from the user

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