In each home, the system consists of a projector, a camera, and a videoconferencing system. The videoconferencing is used for face-to-face communication, while the camera-projector system allows both users to view items placed and manipulated on each other’s table. Since the surface of the table is dry-erasable, the parent and child can add notes and drawings with markers.
Source: Yarosh, S. 2008. Supporting parent-child interaction in divorced families. In Proceedings of the 7th International Conference on Interaction Design and Children (IDC’08). ACM Press, 33–36.
http://lanayarosh.com/2012/08/setting-up-automated-video-recording-for-evaluating-your-system-in-the-field/
(ShareTable secondary: http://www.ic.gatech.edu/features/sharetable)