Oz

Oz, also called the "Whiz system" or "Whiz network", was a planned digital city created by Whiz co-founder William Ackerson at the height of his success.

Before A Trick of Light
William Ackerson built Oz as a "virtual utopia" that everyone would be able to connect to. The Inventor used it to acquaint himself with the human world when he arrived, but he left behind trace code in the process, which William Ackerson used to create a powerful encryption technology that Wesley Park stole and used to found a successful communications security company that would later become OPTIC. Meanwhile, William investigated the trace code he had discovered in Oz, to the point that the Whiz company collapsed and its web portals were sealed.

A Trick of Light
Although Cameron tried to access Oz before becoming cyberkinetic, it remained impregnable until he decided to "renovate" it as a world that he and Nia could share. Finally gaining access using his cyberkinetic powers, Cameron and Nia renovated a small section of Oz as a malleable room where they could generate anything they liked, with entry points for each of them. Cameron created a dog named Dogue for Nia in this space, and she gave it the ability to speak.

It was here that Nia left her distress signal when the Inventor cut off her internet access, which Cameron found. Nia also came here briefly after escaping from the Inventor's prison, but Dogue did not recognize her due to how warped she had become after being freed. Cameron eventually reinforced the security around Oz to be able to contain Nia, and she took up residence in it. Oz was then hosted on a state of the art server array provided by OPTIC, and Nia finished renovating it into a suitable home and paradise for herself, even renaming Dogue to "Barry".

Trivia

 * Oz was named after the titular country from the novel The Wonderful Wizard of Oz, in reference to its parent company being named "Whiz", as in "computer whiz" or "computer wizard". It was also made difficult to get to, just like the Land of Oz was in fiction.