System and method for wirelessly controlling systems in an asset, such as a house or trailer, in which a movable device, such as a PDA, cellular telephone or vehicle, includes a transmitter arranged to transmit signals, and a control unit is arranged on or in connection with the asset and includes a receiver which communicates with the transmitter and a processor coupled to the receiver and which generates different command signals based on signals generated by the transmitter and received by the receiver. Each system is arranged on or in connection with the asset and coupled to the control unit and is responsive to command signals from the processor to perform a function relating to or affecting the asset.