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Thanks guys. It is great to get a little extra info/verification on this. I suspected the tracker wasn't written with this in mind.

For the record, in my experience: The openni_tracker doesn't actually lose the original person it was tracking, it keeps tracking them just fine. However, it does register multiple new users while it is moving. I've noticed that the openni_tracker tends to segfault when too many people enter/leave the scene. So, perhaps if the openni linux code gets more stable and can deal with all that chaos of adding and removing users you will be able to move around the kinect.