The way to enter in the cheats would be to press enter,
type in the message, then press enter again.
A message (Cheater most foul) would be shown if done
!the sun also rises - reveals map
!golden boy - gives you 5000 resources, 1000 butanium
!the great pumpkin - wins entire CAMPAIGN
!i am the bishop of battle - wins MISSION
!on a mission from gawd - fast build and resource gathering