You go to the computer behind the chair and type in codes. If you type in "help" it gives you some codes and if you type in "zork" it gives you an achievment.
You can not get out of the chair. It is part of the game that you dont play. You just watch.
press L2 and R2 rapidly
For xbox you repeatedly tap x
When you are in the chair tap lt,rt, really fast and you can get out of the chair
Press both trigger buttons a few times.
Alternate the triggers. I think it's (RB) and (RT)
You are stuck in the chair until the second to last mission: "Revalations" Also, in the main menu, you can look around.
If you are talking about the computer after you get out of the chair, it is DOA. This unlocks all the new Zombies maps.
get up from the chair in the menu, go to the computer and type in DOA
The call of duty world at war is not a prequel to call of duty black opst.
call of duty black ops
You break out of the chair in the main menu by looking at your hands and alternating the triggers. then walk around the chair to the computer and type in DOA.