In fact, even if a user turns on his or screen to access cloud (or iCloud) apps, there is still a full OS running behind that screen in the device.

FORBES: Cloud May Put Operating Systems Out of Their Misery

Apple built the iPhone's touch-sensitive screen atop an OS X foundation, presaging fresh innovations to come.

FORBES: Magazine Article

When you plug in the handset, the display turns into an all-in-one PC, with Ice Cream Sandwich as your desktop OS. Since the 1920 x 1200 screen isn't touch-enabled, you'll have to get used to interacting with Android using only a mouse and keyboard.

ENGADGET: ASUS shows off a docking monitor built for the PadFone, we go hands-on (video)