Question: What is an environment variable? What does the PATH environment variable contain? What is PATH used for? What are the 4 major jobs of a

What is an environment variable? What does the PATH environment variable contain? What is PATH used for? What are the 4 major jobs of a modern operating system?

In memory management, what is the role of a 'dirty bit', and why do we keep track of it?

What is meant by the term 'user mode', and what is meant by the term 'kernel mode'?

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