(coexisting on another dimensional plane)
In 2370, the station was the command post for Alliance authority throughout the Bajor sector, under the command of Intendant Kira Nerys. The station also served as a processing center for uridium ore mined from Bajor; the processing facilities were manned by Terran slaves. (DS9: "Crossover")
In 2371, Terran rebels led by Miles "Smiley" O'Brien and Commander Benjamin Sisko conducted on operation to retrieve Professor Jennifer Sisko from the station. Using Rom as a double agent to get aboard the station, the rebels plan was subsequently found out by Intendant Kira, who had Rom tortured and executed. Commander Sisko was forced to use his knowledge of Deep Space 9 to activate Terok Nor's self-destruct sequence in order to secure the rebels' escape from the station. Sisko sent Kira the necessary codes to deactivate the self destruct after the rebels' safe departure. (DS9: "Through the Looking Glass")
In 2372, the Terran Rebellion wrestled control of the space station away from the Alliance. The Alliance, determined to recapture the station, sent a fleet of ships under Regent Worf to fight the rebels. By the time they arrived, the rebels had completed the ISS Defiant, which was based on schematics for the USS Defiant stolen from the primary universe. The Alliance fleet was defeated and Terok Nor remained a base of operations for the Terran Rebellion for at least the next three years. (DS9: "Shattered Mirror", "The Emperor's New Cloak")
In the Deep Space Nine book trilogy Millennium, a Pah-wraith possessed Dukat hides in Terok Nor, awaiting his final confrontation with Weyoun, kai of the Pah-wraiths from a second wormhole. In the book, Dukat has turned Terok Nor into a house of horrors.
In the mirror universe anthology Obsidian Alliances, the fact that Terok Nor can remain the center of the Terran Rebellion even though it orbits Bajor is explained. The station has threatened to bombard Bajor if it is attacked, which would kill billions as well as devastate the Bajoran environment for centuries, forcing Bajor to prevent attacks on Terok Nor by the Alliance.