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There are no "major topics" in man, it is a database. you enter "man command" and it tells you about the command. Try it with some of the commands you know. You can even enter "man man" to get help...

Yes, that's right. Maybe this might help clear things for you (I hope):

Kernel (computer science) - Simple English Wikipedia, the free encyclopedia...

The kernel is the operating system, at least the critical part of it.

Use the man command to look at how to use the mesg command. man mesg

This should give you the information that you need to solve your problem/answer your question.

I don't think they mean environment variable in this context, though 'mesg' is definitely a thing, see 'man mesg'.

Your welcome.

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Let's put it this way: The Kernel hides a lot of "complexities" which would have made programming a computer a lot more complicated.

Back before operating systems (and kernels) were there people...

The kernel is the operating system. The intermediates you are thinking about are things like device drivers. You need some but not necessarily all drivers to accomplish a given task.