The question was "how". It was answered with only references to "what" and "where". Why is that?
Because if you want to know the "how" of things, you first have to understand the "why" of things.
"Why?" is not a scientific question (these days).
And so, since I cannot clear up this conundrum for you, you have to go see for yourself.
At least, that is my understanding of the matter. FWIW