How to run dual screens with New Dell XPS to Dell Inspiron Duo?

I'm looking at running dual screens from my 2010 Dell XPS to my dell inspiron Duo, so i can use the inspiron as like a touch screen monitor. Any suggestions for cables or software that could make that happen? My XPS only has a HDMI out. And the inspiron has no HDMI or VGA but I can get a docking station with vga for it.How to run dual screens with New Dell XPS to Dell Inspiron Duo?i think you would need tech support for that...