Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey.All hotkeys can be changed on the trainer.
NumPad1: Change Wood By 500
NumPad2: Change Food By 500
NumPad3: Change Gold By 500
NumPad4: Change Stone By 500
NumPad5: Set Population Limit To Maximum
NumPad6: Instant Unit
NumPad7: Instant Build
NumPad8: Instant Research
NumPad9: Override Maximum Population Limit 4
Set Population Limit: Press hotkey to instantly raise your population limit to the maximum.
Override Maximum Population Limit: The maximum population limit is 50 for campaign or max 250 for custom games.
Using this cheat will allow you to go even further and build much more units.