This particular video design for the Chris Tomlin Tour (featuring Matt Redman and Louie Giglio) featured a center screen driven by ProPresenter surrounded by Barco MiStrips driven by ProVideoPlayer.
The tour needed to be able to change video on the projector and strips at the same time, but they were driven by different programs running different applications. Enter the Master Control Module, which allowed backgrounds in ProPresenter to be controlled by ProVideoPlayer. This allowed the ProPresenter operator to focus on lyrics and the PVP operator to control backgrounds coming from both machines.
Note: this functionality is now available to control a ProPresenter machine from another ProPresenter machine.