You can track two hands with the PointViewer sample. You need juste to activate this on the NITE.ini
file that you can find at C:\Program Files (x86)\Prime Sense\NITE\Hands\Data. It is enough to uncomment the two lines.
http://groups.google.com/group/openni-dev/browse_thread/thread/b3347a34db0ac6f6/72c99a2122c3f397?lnk=gst&q=PointViewer+two+hands#72c99a2122c3f397
