It depends on hypersonic gliding maneuvers, the largest supersonic parachute ever deployed, eight hydrazine rocket engines firing in sequence and an elaborate system of tethers called a "sky crane" that are meant to lower the landing craft gently to the ground.
The system logs the sequence of these cues, and then compares sequences from different speakers to see which combinations routinely lead to a listener nodding, and which do not.
Indeed, after identifying an update from the remote, the Sonos system downloaded it and in turn seamlessly updated both ZonePlayers in sequence without intervention.
Once inside, many programs alter the registry keys that are checked during each start-up sequence, allowing the malicious software to be re-installed after a system has been remediated.