g moving the joystick icon diagonally sends signals to both the pan and tilt motors the rotational speed of the motors is dependent upon the distance the joystick icon 402 is moved from its center home position for instance moving the joystick icon 402 a small distance from its home position causes slow rotation while moving the joystick icon 402 a greater distance from its home position causes faster rotation in the joystick control mode main portion 104 of the user interface is one solid color e g white alternatively main portion 104 may receive and display video from the camera in the pan and tilt system in such a case joystick icon 204 may be presented in transparent or translucent graphics such that a user can see video from the camera behind the joystick icon fig5 shows an example of a controller in a trackball control mode e g after selecting trackball icon 206 in fig2 in the trackball control mode main portion 104 of the user interface include a trackball icon 502 a user is able to simulate rotating trackball icon 502 by touching the icon and moving it in any direction e g up down left right diagonally the trackball icon 502 has simulated momentum for instance the trackball icon 502 will continue u201c rotating.