Forum:KB:How do x-wings turn?

My friends and I recently got the game Star Wars Battlefront. In it noticed that x-wings/TIE fighters/A wings/TIE interceptors don't have rudders(what planes use to turns). I thought about it and one of my friends thought of something. He thought if you weakened the strength of one side of the engines it would turn in that direction. At first it made sense but I then realized he wasn't. He was, if the x wing was inside an atmosphere. Because his theory would require wind resistance.which isn't in space. Also TIE fighters only have two engines which means they couldn't go up or down. So does any one have a clue how a star fighter can turn.