OS X has a variety of features that help people navigate, view windows and other items, as well as aid people with visual and hearing disabilities. Some of these features are relatively obscure, and need to be researched to enable, but others are more easily enabled. One of these, which has puzzled new OS X users is when the desktop seems to be larger than the extents of the screen, regardless of the resolution being used. This results in the screen moving around with the movement of the mouse.
