The camera's position is marked in the 2D window by the blue diamond. LEFT Rotates the camera left. A Tilts the camera up. Z Tilts the camera down. D Moves the camera up.
C Moves the camera down.
HOME Centers the camera view. Experiment with moving the camera around. Then type in a zero in all three fields. Window - This window gives you a means to keep track of and manipulate the height of your brushes without having to constantly switch back and forth between the top and side views. You can move up and down in the Z-height Window as you would in the 2D window, by holding down the right mouse button.