MP Evas' Dummy plugs, labelled "Kaworu"
The Dummy System consist of dummy plugs that serve as artificial pilots (they emulate a pilot's thought processes and send signals to the Eva). All the regular Eva units are eventually fitted so they can be operated with either the pilot or the dummy plug. There are two known types of dummy plugs, those loaded with the personal data of Rei Ayanami and those with the personal data of Kaworu Nagisa (the latter was used in the Mass Production Evangelions).
Among the original Evas, Unit-01 is the only one incompatible with the DPS, which is methodically rejected at every activation attempt after the first one.
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The Dummy System screen inside Unit-01's Entry Plug
In the second Rebuild of Evangelion movie, the Dummy System is labelled as DMYSYS and is an expanding control unit that covers the pilot, blocking their view and clamping down on their two joysticks, preventing the pilot from moving them. Unit-01 in Dummy mode also did not display any of the outside world to the pilot inside the EVA. The Dummy Plug system was built in NERV's Golgotha base and deployed to Tokyo-3 prior to the delivery of Unit-03.
Trivia
- In Evangelion: 2.0 You Can (Not) Advance, during the scene where the Dummy Plug System takes control of Evangelion Unit-01, if played backwards, the mechanical sounds become the quote "To be dominated by me is not as bad for human pride as to be dominated by others of your species" from the movie Colossus: The Forbin Project.