I have a Dell 3521 laptop with one HDMI port and an Intel HD 4000 display. I was wondering how would I go about having two 'extended' displays. One of my monitors have a vga and dvi and the other one has HDMI, vga, and dvi. For one of them, I can connect with HDMI but what should I do for the other? I've read that you can get a usb to vga and will it work with that?