Hey,
We are working on a multiple device project.
In your example scene "Multi-Device (Desktop)", you implement the scene for 2 devices in default.
When we try to add another device, the calibration work only for the first 2 devices.
If there are additional projects with multiple device,
or documentation that explain how to work with this,
We will be happy to receive a link
Thanks
http://blog.leapmotion.com/multiple-devices/