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- "Always another way."
- ―The Keymaker [src]
A backdoor is a type of door that can be used to access nearly any part of the Matrix.
Within the construct, they are a series of dark green doors in a seemingly endless white corridor, unlocked by a special made key. These were used by programs to quickly get from one place to another. In code, these were simply loopholes. At one end of the corridor was a door to the most special rooms, including the door to The Source. Backdoors act as a kind of shortcut hyperlinking system.