Evola
A videogame about the wonders of operating system concepts.
...Operating system constructs like signals, files and network ports are represented by objects in this world, and their usage is exposed to running programs by their presence.
STORY: EvulOS was invented by a grad student for his thesis, and later gained government research funding. But its inventor is not the only one working on it. A secret organization has copied his operating system, launching a plot to destroy the digital infrastructure of modern society. A committee organized to coordinate the handling of this crisis has hired an expert videogamer (the player) to prevent that evil plan from coming to fruition.