Okay so nowadays, for tv productions and film, those computer and tv screens that you see in some scenes are most often times added in post-production.
As a 2D artist/matte painter, I end up designing a lot of those screen interfaces.
Whenever actors put their fingers all over a keyboard or a supposedly tactile screen while techno babbling, someone has to make up a choreography that at least -seems- to go along with the input.
Whenever I get assigned to those shots, my job is to take random screen and keyboard booping and make it seem smart.
It’s not always easy.