I've just bought a vostro 3550 with 2 video cards: AMD RADEON HD 6630M and Mobile Intel HD graphics. I see the catalyst control center that help me to assign a video card to a specific application. Yesterday I assigned HIGH PERFORMANCES to the VLC application but today if I open the catalyst control center I do not see that application listed. Why? And another question: how  to disable one of the 2 video card and using just the other?

Thanks in advance an regards

MB