Not to be nitpicky, but the "CAD" acronym is usually taken as Computer Aided Design, which can be 2D or 3D (though why anybody would want to design in 2D escapes me), and "CAM" is Computer Aided Manufacturing (i.e. CNC). AutoCad ended on top for awhile due to agressive marketing and not enforcing software piracy laws, so that everybody had a pirate copy and thus knew how to use it. They tried to improve its usefulness for mechanical design with the "mechanical desktop" package, but ultimately they dropped the whole thing when they created their "Inventor" software (kind of an imitation of Solidworks). -Dana It did what? Well, it's not supposed to do that.