input devices for computers; input devices for electronic test equipment; input devices for electronic measurement equipment; computer mice; mouse pads; wrist supports for computer mouse users; wireless computer mice; computer hardware; computer hardware and peripheral devices; electromagnetic buried object locators; video camera systems comprising video cameras and video camera display devices, namely, screens and monitors; video display and control systems comprising video monitors and camera control units; transmitters for use with buried object locators; computer software for use with camera control units; computer software for receiving signals from input devices and generating output command or control signals; computer graphics software; computer game software; computer aided design (CAD) software for designing parts, assemblies or devices on a computer system for general use; computer aided manufacturing (CAM) software for designing parts, assemblies or devices for computer aided manufacturing for general use; software for receiving input device signals and controlling the output of a display device; software for receiving input device signals and controlling operation of an electronic test or measurement system; virtual reality computer hardware and software for allowing a user to interact with virtual objects or environments using a magnetically sensed user input device; video game software; simulation software for simulating processes or user operations; computer based mapping hardware and software