Downloadable electronic multimedia application software for use in accessing and viewing information featuring travel, instruction manuals for electronics, operating manuals for transportation equipment and electronic equipment; electronic multimedia application software recorded on CD-ROM for use in accessing and viewing information featuring travel, instruction manuals for electronics, operating manuals for transportation equipment and electronic equipment; electronic control systems for engines, heating and air conditioning systems, door and window position sensors, lighting fixtures, electrical supply systems, fuel containers, devices used to assist in leveling wheeled vehicles; electronic monitoring devices for monitoring the following items in mobile residential objects, namely, heating and air conditioning systems, door and window position sensors, lighting fixture status and function, electrical supply systems, the state of fuel containers, horizontal level of wheeled vehicles, and GPS navigation device for caravans, houseboats, and boats with cabins; computer hardware and downloadable computer operating software for the aforementioned electronic monitoring devices and electronic control systems; downloadable computer operating software sold as an integrated part of electronic monitoring devices and electronic control systems