Update Terminals are highly advanced computer terminals used by sufficiently powerful beings to directly interact with the Narrative and, by extension, the Destroy the Godmodder series. Only beings with a power level equivalent or above a First Guardian's can use an Update Terminal, though some Narrative-altering beings can temporarily hijack it.
Using an Update Terminal, one can use the Narrative to guide the story of DTG down a good path where the Godmodder loses and the players win. The actions of the being behind the Update Terminal are presented in the form of a forum game. The Update Terminal can also act as a normal computer, and seems to work with a drawing tablet. It also has a voice-to-text transcriber, and is immune to nearly all computer viruses, bar ones created by immensely powerful beings such as the Employer.
The Operator (and whoever he inhabits), Doc Scratch, Lord English, and The_Nonexistent_Tazz (while empowered with the Red Sun) have all been shown to use an Update Terminal. During Intermission 1 of Destroy the Godmodder 2, when the Update Terminal was temporarily corrupted, players were able to mess with the game at will. ninjatwist321 and The_Serpent made use of this, creating minigames. Psycho Waluigi and The Hypnotoad temporarily hijacked the Update Terminal later in the game as well.