The show is loosely based on the movie, and there’s no reason to think that’s how it worked in the show. In the show, it’s pretty easy to conclude that a lot of that type of stuff was controlled by an AI advanced enough to “just know the difference” between the humans and the hosts.
But it was never explained, and that’s fine because leaving stuff like that as a mystery is a big part of storytelling. Or, they wanted to avoid having a bunch of scenes with characters spewing technological gobbledygook like Star Trek.
