The 15 options (there are actualy more) are unlimited Energy,       
ammo(9),items(4) and handgranades(1) + activation of ammo , weapons 
items , keys and the Game Items (the ones you are supesed to find   
during the game , fun eh :) this last options is actualy about 10-20
pluses but why count everything so i count it as one plus           
                                                                    
To use the trainer just run trainer.exe and then the game , then    
alt-tab to the trainer , and select some options , and dont exit it 
if you are using unlimited energy. And you might have to press the  
options again if reload a game.                                     