Just by looking at the bullet points on the linked page, I'm guessing it checks your PC's vital components and if one of them isn't functioning properly, it generates a 2-digit error code (displayed on the LCD on the card), then the user only has to look up what that 2-digit error code means from the card's manual and replace the faulty component.
Sorry if it totally doesn't work like that, I'm just pulling stuff out of my @$$ here
