A1: If you're talking about where the sealed door with the old man, then you just have to go in the computer area and do the following: it may take you a couple of times trying to get the right sequence for the printout that you will receive.

1] Go to the back wall and turn on the switch.
2] Pay close attention to the taller case computers, so that you can see'
which one is lit up the most.
3] Once you identify the hot case, go to it and hit the switch, while the
old man will be doing the same on the other side for you.
4] If you can get them all before they overheat, you will then receive the
the printout cards with the information that you need.

GOOD LUCK!

A2: Talk to the old man,this takes some time as he is etcentric,once your ready he will tell you to start.so start the server up,then the tall case towers you need to hit the switch in a sequence,you can view the sequence if you switch on your heat senors on your goggles,they should light up in a red colour.once thats done go back to the old man and the print out card will be available,on-screen prompt will ask you "take"
thats it,very simple.if you mess up the old man will tell you to re-start.
just use your heat goggles to look at the towers,from memory I think only three you need to click in sequence.