Activating this trainer

If not state otherwise below, press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.

Trainer Options

# Player 
     NumPad1: Unlimited Health
     NumPad2: Unlimited Jumps
     NumPad3: Unlimited Continues

# Items 
     NumPad4: Unlimited Pipe Bombs

# Mission 
     NumPad5: Unlimited Mission Time

# Gameplay 
     NumPad6: Game Speed

Editor Options

# Locks 
     Infinite Mode Unlocked
     Boss Rush Mode Unlocked
     Mother of the Future Mode Unlocked
     Ultra Unlocked
     Cheats Unlocked

# Mission 
     Mission Time Remaining
     Time Limit
     Fast Time

# Gameplay 
     Score This Level
     Kills This Level
     Score
     Overall Rank
     Continues

Notes

Cheats Unlocked:
No idea what this does.  May unlock special keys or menus or allow certain special things.  Report if you find something.