1. A device management method for changing a data structure in a separate wireless mobile client device by executing consecutive instructions in the wireless mobile client device, the method comprising: forming at least one device management instruction sequence by a user application residing in a second electronic device, wherein the device management instruction sequence comprises: command sequences including single commands, and; control structures including conditional commands to be executed in the mobile client device; transmitting the formed device management instruction sequence from the user application residing in the second electronic device to a device management server residing in a third electronic device; and executing the command sequences and control structures of the device management instruction sequence by remote control of the device management server in the separate wireless mobile client device for changing the data structure in the wireless mobile client device.