Aisakah

Now, I have looked at through all of the posts, including the one about making the screen resolution larger. But what I'm very curious about, is how to make the screen resolution full screen, is it possible? A friend I wish to play with is very stubborn, always wanting games to be full screen. His game also has a problem, he can't see parts of things, like his skill bar so he can't really use any skills or even set them, so that's another reason why he would like full screen. I would also like the same, I always did enjoy having games full screen. Also, his resolution is larger than what they offer. Please help, asap. Thank you. c: