Press ESC again and type:
 

GIVEME
 Gives all weapons
 
KILLEM
 Kills bad guys
 
PROTECTME
 Invulnerable
 
HEALME
 Heals(what else)
 
LOADME
 Unlimited ammo
 
MOVEME
 Gives saved games of all levels
 
AGENTJ
 Be agent J
 
AGENTK
 Be agent K
 
AGENTL
 Be agent L