Ok, you can't use both adapters at the same time. And if you have multiple monitors connected, you can designate what is displayed where, including using the laptop display AND a second display, but right clicking the desktop, selecting screen resolution, and changing the options in the desktop display dialogue that appears. You can designate the primary display, secondary display, whether to display only on one monitor or both and whether to extend the displays, which is what you generally want to do if you have two monitors that are not in an eyefinity type configuration is select the extend option.