2.) On a windy day, the same logic applies. The wind passing over an open, unobstructed hole in the roof would result in lower pressure outside the roof hole. Air inside the attic would move to lower pressure through the hole. With a turbine, the wind spins the turbine fan but that does not result in lower pressure.
Computer engineering or Computer Science engineering integrates several disciplines such as Information Technology, Electrical and Electronics Engineering, Software Design, etc. The engineers are mainly involved in the development of software and hardware systems of various aspects of computing.
Computer engineering is engineering of software and hardware at the level of computer (computation). that's how I look at computer science. By the way, you can be a pure computer scientist, and just do research, and decide to isolate yourself from the engineers.