I run both a macbook and a macpro and periodically synchronize between the two of them.
Unfortunately as the screen on the macpro is considerably bigger than the macbook 13″. Occasionally I open an application only to find the window is bigger than the screen so using the mouse I cannot minimise. Help is at hand (with iTunes as least).
Press the [ALT] key and the click the green (+) at the top left hand corner of the window at the same time sends the window full screen at the current resolution.