Mouse Over Area detection

Is there a way to detect where on a particular object the cursor is hovering over. Specifically, a large cube is on screen and if I move the cursor onto the cube, I would like feedback as to where on the cube face I am pointing to (upper left, mid lower, etc.. the actual x,y,z point where the ray hits would be good). This is just the mouse over and no click would happen yet. Thank You.
tw