SyncTV is a system for sharing a common TV channel. When one partner selects a channel to watch, the TV channel of the remote person automatically changes to the same channel.
Source: Tsujita, H., Tsukada, K., and Siio, I. 2008. SyncDecor. In Proceedings of the Working Conference on Advanced Visual Interfaces (AVI’08). ACM Press, 449–453.
http://tsujita.org/projects/syncdecor/ja/