What is the Gsync feature used for?

What is the Gsync feature used for?

The Gsync card in the Quadro Plex Model I and Model II are used to synchronize displays across multiple computer systems.  For more information on configuring your Quadro Plex system, please check your user guide or visit the Quardo Plex technical documents page at http://www.nvidia.com/page/quadroplex_tech_docs.html