Creating a truly multi-user, multi-touch display is a tricky prospect. How do you know who's who short of turning the screen into one giant fingerprint reader? Chris Harrison, Ivan Poupyrev and Munehiko Sato at Disney Research have suggested in a paper that fingerprinting on a capacitive touchscreen isn't far off -- it's just what we need to fingerprint that matters. Rather than look for physical ridges, the scientists' method sweeps through AC frequencies to find the exact electrical impedances of fingertips in contact with the screen. Different bodies, different clothes and even different shoes give everyone a unique signature that lets the screen identify specific people, even when they each have multiple fingers in play. The researchers propose that the technique would work well in collaborative workspaces, personalized devices and security, but let's not forget that this is Disney we're talking about: it's placing a strong emphasis on the prospects for shared screen gaming without the limitations we know today. While any practical use is still some distance away, it's easy to see future tablets and tables that are designed from the start to encourage a little socializing.

Filed under: Gaming, Tablets, Science

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Source: Disney Research

If there's ever been a persistent gripe among families sharing mobile devices, it's been the absence of multiple user profiles -- hand that iPad or Nexus 7 to Junior and you may have to play a spot-the-differences game when it comes back. Some long overdue testing of previously found code references in Jelly Bean shows that Google, at least, has explored ending that anxiety over who uses the family gadgets. Command-line code in AOSP-based versions of Android 4.1 will let you create a separate guest profile, complete with its own lock screen security, home screen layout and limited settings. To say that the code is unpolished would be an understatement, however. Apps and even some notifications cross over from the main account, which could prove more than a little embarrassing if the hardware is left in the wrong hands. At least it's easy to revert back, as the instructions (and video after the break) show. The real challenge will be waiting to see when -- or really, if -- Google gets to finishing multi-user code and turns that Nexus 7 into the communal tablet we want it to be.

Filed under: Cellphones, Tablets, Software

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