Directive 8020 is filled with locked doors and computers you need passwords to access, and when you're trying to quickly make your way through a section without getting spotted, not knowing where to look for key codes can make tasks a lot harder. It's impossible to stand around and input thousands of potential passwords, especially when any number of alien lifeforms could get to you before you find the correct one. So it's best to spend that time searching for hints instead...
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Where to find the key code to Carter's PC in Directive 8020
Source: PC Gamer (opens in a new tab)