Roland’s DG Connect Hub application enables your printers to communicate with the cloud. When you first install and launch the DG Connect Hub, the application will search for Roland devices and register them to your account automatically.

All of this is explained in detail in an article by Scott Burgess on the Roland website today. The article shows how the application allows you to launch any application that is associated with one or more Roland devices. You are then able to launch the available applications from inside the DG Connect Hub.