I check for the doors every morning. The door room moves about but it likes me so it lets me know where it is when it moves. And I dunno how it does that. Either of the things, really. I'm not a nerd, so I never really studied them. You might want to ask Tommy or Sarah or any of the scientists if they know anything about how the doors work.
The doors tend to be related to the people who're here, yeah. Sometimes you'll get a couple at the same time, but mostly it's just one open.