How to make a process unkillable?

Question

Windows

How to make my process unterminated?
I saw a couple of software:

SubInACL
MsCormick
srvany.exe

But I didn’t find the documentation, namely “how to make the process unkillable”
I saw that in the first program, you can put DENY to end the process, but I don’t know how

Answer 1

nothing at all
, but you can learn from virus writers how to make it as hard to kill as possible

Answer 2

You can't want to kill what you can't see).