Read/write. But I don't know if all tag regions are accessible.
Hand analysis produces points for finger prints, point for hand/palm center, points for joints and full outline of the hand shape.
You can create wireframes by connecting the dots if you want, and then track them.
It can understand many things but you can create wonders with the data provided.
The outline specifically works with everything and you can write an AI parser code for that to identify different object shapes and movement.
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Nice to listen about your new discovement.I have a maybe still stupid question : the hand analysis code is on the joycon fimware and the analisis is done on it ?
I know i did the same question about vibration files but if i dont remember bad the kinect had some code on the fimware which made the device give its raw data filtered (giving diferent kind of data depending of the configuration : from rgba imagenes to point cloud image data) which MS always said than they dont wanna anyone reverse enginering this code (they were happy than people use the kinect on pc but no allow people re his fimware code ).Later all tracking was done for the external machine (which was the problem it had on its games : the xbox 360 was no enought powerfull to procesate the data and generating the tracking on real time as it has happen on pc which many programs people has done (i hope you dont disturb i paste here the links explaining what i mean (i dont know if it would be posible using the data from joycon,i doubt it has the same level because resolution limitation)
http://users.ics.forth.gr/~argyros/res_kinecthandtracking.html
http://users.ics.forth.gr/~argyros/res_hope.html
also MS make made some advanced on this method for real time hand estimation:
http://www.jiansun.org/papers/CVPR14_HandTracking.pdf