Press [C] during the game and then type

 marvin

 Press [C] again and then press [F2] to bring up the console.
 Now you might type in:

 cheat full               - Heal player
 cheat god                - God mode
 edit abilities           - Change ability
 toggle time              - Toggle clock display
 set time                 - Change current time
 first person             - First person view
 insert                   - Spawn indicated item
 insert gold              - 1000 gold in bag (subtracts 100 experience)
 invisible                - Invisible to enemies
 toggle inertiatarge      - Unknown
 goto waypoint            - Transport to way point, way points might be:

                            Khorinis lighthouse - LIGHTHOUSE
                            Near Pepe's sheep - SHEEP
                            North of Landowner's farm - WOLF
                            Torch near Landowner's farm - FIRE
                            Xardas - XARDAS