Press ENTER during game play, then activate the following cheats by entering the corresponding codes:

CHEAT FUNCTION - CHEAT CODE
Add 1000 Stone - therock
Add 1000 Wood - ent
Add 1000 Ore - gabriel
Add 1000 Gold - dutyfree
10000 of all resources - itsgoodtobetheking
Invincibility - keepemcoming
Full map - enlightenme
Win mission - iamsolame or blitzkrieg
Set unit limit to maximum - myhomeismycastle
Unknown - beefcake