Where is the Interkron and how do I use it?

Hint 1 of 5:

Press the button on your wristlet to get into the Interkron.

Hint 2 of 5:

You can only "pilot" the Interkron while the green light is on.

Hint 3 of 5:

When it's red, you need to use a "key."

Hint 4 of 5:

Have you searched the drawer in Vettenmyer's quarters?

Hint 5 of 5:

There's a card that happens to fit into the slot in the Interkron.