I just found out this great tip. It was allready bugging me for some time that I could’t switch between open windows in the same App. That means I could, but I didn’t know how. I finally took some time to browse Google and find out how to do it. Boy this is one big time saver for me, because I allways work in different windows in Apps. Now you know it to!! 
Hold down the Command key and hit ~ (the tilde key, usually to the left of number 1 or right of the shift key). If you do this and you are in an application that has multiple windows open, this will rotate through the open windows.
