Eli5: How do they make the fake OS for computers in movies and are they functional?

Question

Eli5: How do they make the fake OS for computers in movies and are they functional?

In: Technology

Answer 1

There’s so many different ways you could do it – just put an animation over the top of a blank monitor in post, play a video on the screen and have the actor act along to it, use a game engine to create the custom fake OS that has whatever screens are needed hardcoded, [even use real software](https://www.reddit.com/r/MovieDetails/comments/89p4n4/in_jurassic_park_the_infamous_its_a_unix_system_i/).