The Digital Sixth Sense and the MARK of Skinput

SixthSense and Skinput sure seems mighty convenient for a lot of reasons and some of them might not be that obvious, yet. http://phys.org/news186681149.html , www.chrisharrison.net/index.php/Research/Skinput ,
http://research.microsoft.com/en-us/um/redmond/groups/cue/skinput

Geo-tagging can be applied to any technology one way or another.
http://www.wired.com/gadgetlab/2010/03/skinput-turns-your-arm-into-a-touch-screen 

Microsoft's Skinput turns hands, arms into buttons

http://www.cnn.com/2010/TECH/04/19/microsoft.skinput/index.html 

In the old days it was just a paper trail, now its a cyberspace-trail or digital tracking tail.

http://thedigitallabyrinth.blogspot.ca/2012/07/software-and-hardware.html