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 & AP
NumPad2: No Reload
NumPad3: Mega Inventory
NumPad4: Unlimited Carry Weight
NumPad5: Fast Time Of Day
NumPad6: Stealth Mode

Notes:
Infinite Health & AP: While active your health / ap does not decrease.

Mega Inventory: This should give you unlimited inventory space. You may need to pick up an item for it to work.

Unlimited Carry Weight: This should give you unlimited carry weight. You may need to pick up an item for it to work.

Fast Time Of Day: While active the time of day is speed up.

Stealth Mode: While active enemies will not see you. May not work on enemies seen you before or on scripted sequences.