Can you open PC games in windows instead of full screen?

yes, but not all games, in TF2, and other valve games in game there is an option to change it from full screen to windowed. In starcraft you have to rightclick the program and "run in compatability mode" with the windowed box checked... people have mixed results, I personaly like to run WoW in a window so i can alt+tab WAAAAY easier.