The Zero system is installed in the Wing Gundam Zero originally and later in the Gundam Epyon and the Gundam Sandrock( for one episode).
The system works by increasing the pilots reaction time until it is down to Zero( hence the name).It is activated by typing Z-E-R-O in the Gundam' s cockpit after the programme has been installed(in the Sandrock) or will activate itself during battle. It allows the pilot of the mobile suit to fight a lot better than with their normal reaction time( if you have seen some of the other Gundam series' some people have become newtypes- the Zero system gives temporary newtype ability to the user)
But there is a catch- once all the enemies have been destroyed the Zero system continues looking for them. It searches the pilots brain and emphasizes any small doubt or feeling that they have, until the pilot is certain that that is who or what they must destroy.
Zechs can control the Zero system to a certain extent, but not fully, Duo is forced to test it but has visions of destroying the colony that Hilde lives on, so he now wants the Zero system as far away from him as possible! Trowa uses the Wing Gundam Zero to travel to a colony where Catherine is being held hostage, while the Gundam Heavyarms is under repair. He also has visions of destroying the colonies but he also regains the memory of his life before the Vayeate exploded with him inside, causing him to lose his memory. Quatre is the one who completes the Wing Gundam Zero and pilots it when he is temporarily insane after the death of his father. Heero and Trowa battle with him to try and bring him back to his senses- in the course of this battle the Vayeate explodes, causing both Heero and Quatre to believe that Trowa is dead. Now Quatre wants nothing to do with the Zero system because he is afraid that he could lose control again. When Wufei pilots the Wing gundam Zero it shows him ( as it can show all it's pilots)his future. He realizes that his future is fighting with the other Gundam pilots, not by himself.
Heero fully masters the Zero system, although it takes a lot of effort, so the Wing Gundam Zero becomes his. He is the only person to ever master the Zero system.
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