it gives a player a random potential, im not sure how it works again but say for example a player has -9 that means he will have a random minium potential and a maxium potenial, so in one game he could become good and in another he could become world class. Sorry I dont know the values for each figure
I like your name . Im sure theres a downloadable manual somewhere out there....or if you're that desperate for one you could buy another FM copy, take out the manual, and return and hope they don't notice...