It's nothing new. SBS has been available for several years and can provide a quite realistic "radar display" on a PC by decoding Mode S/ADS-B transmissions from aircraft. If they send ADS-B you get the full "radar" picture similar to the real thing with aircraft moving around realtime. If they only transmit Mode S you get a list which can display type, company, registration, speed, altitude, climbing/descending, etc, etc.
It's all dealt with in other threads..