Step 1. Open the Terminal and type "other"

Step 2. Type "View Montior" (Use to be "View Radar")

Step 3. View where your teammate is and the letter/digit next to them. (For example D6) This is the letter/digit assigned to the door

Step 4. Type "D6" (or whatever letter/digit is there) into the terminal

Step 5. If you typed in the right letter/digit, you'll get a message saying (BROADCASTED SPECIAL CODE)

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/// This doesn't work for regular locked doors, only giant electric doors. You'll know em when you seem em

/// Turrets and Mine also have codes and will be disabled for about 5 seconds upon entering the code

/// If the code is covered by anything, it's likely on another floor

/// There is a difference between m1 and M1, watch out of upper and lower cases

/// Doors, turrets, and landmines can share a code on the same map