To activate a cheat code, you must be within a game
and looking at the battle map or war map. Then, 
simply type in one of the following codes: 

ICOMEBACK - Shows all research
ATCHOOO - Purge all Martians (BattleMap only)
PUNYHUMANS - Purge all Humans (BattleMap only)
YOULIKEIT - Boosts efficiency to 100%