Look down at your hands when you are locked up at the title screen. Repeatedly press [Space] to escape from the chair. Move around the lab and find a computer. Type in the following commands to activate the corresponding feature.

DOA: Zombie killing mini-game similar to Smash TV.
3ARC INTEL: View all intel.
3ARC UNLOCK: Unlock Dead Ops Arcade and Presidential Zombie mode.
ZORK or HELLO SAILOR: Zork: The Great Underground Empire text adventure game.
DIR: List audio files and pictures for use with CAT command.
CAT or PRINT <filename>: Open corresponding file.
WHO: List of login names for use with the RLOGIN command (requires passwords).
LOGIN: Attempt a new session with a corresponding username and password
DIR or LS: Display contents of the current directory.
ENCODE: Encode a string using the CIA's cipher.
DECODE: Decode a string using the CIA's cipher.
MAIL: Open the mail folder for the current user.
FOOBAR: Displays "Fee Fie Foe Foo!"
ALICIA: Alicia virtual therapist game.
HELP: List commands.