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"We're about 20 minutes away from the point where Clarke's law kicks in and technology becomes indistinguishable from magic."
- Peter Watts

Dattoo  
  A data exchange device worn on the skin like a tattoo.  

Peel-and-stick information transfer.

The doctor watched him closely while he pulled out a reddish-purple dragon about two inches long, printed on a sheet of pliable plastic. The package also contained a badge on a black braided lanyard and a photo of a woman with medium-long hair.

"These are my credentials for the COPES conference, across the street," Plover said. "They'll get you past most of the outer security. The dragon is a skin computer, A dattoo. People put it on their arms and exchange personal data. I've preloaded this one with crucial information. She'll be wearing a dattoo as well. Cross arms, like this." He demonstrated by hooking his arm around Nathaniel's. "It works through clothing."

Nathaniel was amused. He rolled up his sleeve and peeled the dattoo from its plastic sheet. It laid down easily on his inner forearm and conformed to the skin, stretching a little.

From Mariposa, by Greg Bear.
Published by Vanguard Press in 2009
Additional resources -

These concepts are getting closer to reality; see this concept from 2007 - Dattoo Personal Skinprint Technology Concept and another interesting device from 2004 - see iBand Exchanges Data With Handshake But Lacks Hand Jive Recognition .

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  More Ideas and Technology from Mariposa
  More Ideas and Technology by Greg Bear
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