Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.
Trainer Options:
NumPad1: Infinite Health
NumPad2: No Reload
NumPad3: Unlimited Ammo
NumPad4: Super Speed
NumPad5: Unlimited Resources
NumPad6: One Hit Kills