HP launches what it describes as "one device that's every device" at MWC 2015-- the Elite x3, a business-focused Windows 10-powered smartphone able to turn into either a PC or laptop via appropriate accessories.
As one might (rightly) assume the Elite x3 makes heavy use of Continuum, the Windows 10 feature providing users with a PC-style experience on a smartphone through connection of a larger display, keyboard and mouse. Thus HP provides a pair of optional accessories for such purposes, the Desk Dock and the Mobile Extender.
The Desk Dock is simple enough, being a dock providing all the necessary ports (x2 USB, x1 USB-C, x1 DisplayPort, x1 ethernet) to transform the Elite x3 into a desktop PC. Meanwhile the confusingly named Mobile Extender actually is a notebook of sorts complete with 48Wh battery, 12.5-inch display, full-size keyboard and trackpad one can wirelessly pair with the smartphone.