DMS-59 Video Card question?

With a video card that has DMS-59 output will I be able to extend my display across two monitors using a Dual DVI Y-Cable or will I only be able to clone/duplicate the display?|||You will be able to extend your display. You can clone if you want too. Just need a dongle that matches the DMS-59 output. You can also adapt each DVI port on the the dongle to VGA.