To open the door on the first stage of the MI6 Trainig camp, go to the door first, then go to the bit that looks like a square. on the corner there will be another computer. go near it and Alex will say something. then go into the room near the bit where you saw the computer. you will find a peice of paper with some numbers on. Go back to the computer and the door will open. this will take you to the next stage.