There are a total of 3 optional computers that you will need to interact with during 1 playthrough of the game.
22:58 -
Computer 1 (first area of level 2; top right; read all 4 sections/pages of the computer)
28:47 -
Computer 2 (Commissioner’s Room - on the desk)
45:18 -
Computer 3 (Vent area office room; interact with computer after changing filter)