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Deus Ex: Human Revolution Hints
How can I unlock this door?
1 of 4: Look to the left of it to find one of those little black security code entry devices.
2 of 4: Since you don't have a code, trying to enter one is useless. Instead, choose to hack the thing.
3 of 4: See the game manual's "Hacking" section and/or the in-game tutorial to learn about hacking, and don't forget to quicksave before you start.
4 of 4: With this lock, all you have to do is capture the directory that's to the left ("west") of your I/O port, followed by the registry, which is "NE" of that directory.