Atlanta, Georgia (CNN) -- In Chris Harrison's ideal world, mobile phones would be the size of matchbooks. They'd have full-size keyboards. They'd browse the Web. They'd play videos.
And, most importantly, you'd never have to touch them.
Sound like too much to ask? Maybe not.
Harrison, a graduate student at Carnegie Mellon University and a former intern at Microsoft Research, has developed a working prototype of a system called Skinput that does just that, essentially by turning a person's hand and forearm into a keyboard and screen.
"People don't love the iPhone keyboard. They use them. But they don't love them," Harrison said in a interview at the recent Computer-Human Interaction conference. "If you could make the iPhone keyboard as big as an arm -- that would be huge."
Using Skinput, a person could tap their thumb and middle finger together to answer a call; touch their forearm to go to the next track on a music player; or flick the center of their palm to select a menu item.
All of these sign-language-like movements, which are customizable, would control a gadget in a person's pocket through a Bluetooth connection.
When fitted with a pico-projector, the Skinput system could display an image of a digital keyboard on a person's forearm. So, using Skinput, someone could send text messages by tappProxy-Connection: keep-alive
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g his or her arm in certain places -- without pulling the phone out of a pocket or purse.
"You could pretty much do a lot of what you do on your iPhone," said Harrison, who says Skinput "is [like having] your iPhone on your palm."
The system, which has been under development for eight months, won't be commercially available for two to seven years, said Dan Morris, a Microsoft researcher who is working with Harrison on Skinput.
Before that can happen, Skinput's sensors need to get more accurate, he said. In a 13-person trial in Seattle, Washington, Skinput was found to be 96 percent accurate. But that test only used five buttons. The system would have to improve for people to make use of a full keyboard, which would be the "holy grail," Morris said.
"The accuracy is good, but it's not quite consumer-level yet," he said.
Skinput is one of a number of prototypes, ideas and near-products aiming to make computing more natural.
These devices seek to move beyond the mouse and physical keyboard, letting people communicate with their gadgets by gesturing, using sign language or, in the case of Skinput, tapping on their hands, fingers and forearms.
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