Is this the type of thing your referring to ?
I'm guessing it's a similar thng to what Dave was talking about Same as in link I also posted above.
The one you just posted though Alf, read the two last reviews, and see if it's going to cause problems on your PC. Before buying, I quite often check out the support site's for said item, and make sure they keep up with driver updates etc. Maybe even read there forums for issues if they have a forum.