Abstract: A system, comprising a primary communication path, a first communication device interfaced with the primary communication path, a second communication device interfaced with the primary communication path for communicating over the primary communication path to the first communication device, a controller for controlling the communication path between the first and second communication devices to allow or inhibit communication there over, a validation communication path, a first validation node interfaced with the validation communication path, a second validation node interfaced with the validation communication path for communicating with the first validation node over the validation communication path where in the presence of a transmission between the first and second validation nodes over the validation communication path constitutes a validation condition to control the mode of operation of the communication to be at least one of inhibiting communication over the primary communication path or allowing c