Re: Movie OS
Much of the time, the movie director just wants the fictional GUI to display a nice big status bar slowly inching towards "100% complete" before the bad guys arrive.
This site goes into more detail: http://tvtropes.org/pmwiki/pmwiki.php/Main/ViewerFriendlyInterface
Another type of 'Movie OS' is more flashy and futuristic.... think Minority Report, or Iron Man. Not all of them are completely silly:
Strange to think that these days mocking up a fiction GUI is fairly easy... however, the wireframe Death Star from the pre-attack briefing scene in Star Wars took Barry Cuba months to create. Ridley Scott's VFX team had CG wireframes on screens in Alien, and later reused them in Blade Runner to keep costs down.