Each input/output device/interface 266 permits interaction with a user or other devices in the network. Each input/output device/interface 266 includes any suitable structure for providing information to or receiving/providing information from a user, including network interface communications. In the case of the sensor 110, the input/output device/interface 266 includes (or is) a sensing unit 267 that monitors and gathers information about an observed subject. For example, the sensing unit 267 may be a camera, a microphone, an infrared sensing unit, or any other such components.