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

Some movies use green screen to add the UI in later, like Hunger Games.

Some actually have to projected to the surface in real life to help actors interact with it better, like in [Oblivion](https://youtu.be/j3r4GE1KDtk?si=VaP727I6f6k6YLfV).