Windows Vista (formerly Longhorn) Developer Center. So here it comes: Windows Presentation Foundation (a.k.a. Avalon) Windows Communication Foundation (a.k.a. Indigo) XML Paper Specification or XPS (a.k.a. Metro) Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Pocket (Opens in new window)Click to email this to a friend (Opens in new window)