Once the cabinet is open, the glow from within reveals a terminal! It is a foot wide and looks like it can be removed from the holder that's propping it up. The screen itself shows a field of stars, but that soon turns black with simple white letters that read:

"To access this terminal, your choice is a simple one: A or B.

"Answer correctly, and you may proceed.

"Answer incorrectly, and you may not live long enough to regret it."

Then two buttons appear onscreen, one with a bright A on it and a B on the other. Both pulse gently as they wait to be chosen.