A multi-function display is provided with selectively autonomous secondary modules. A primary device is made up of a central display controller for determining display functions, and at least one docking port. Each docking port selectively connects a SDD to the primary device mechanically, and electrically connects a docked SDD to the central display controller. Each SDD includes a local display screen, and a local display controller for determining local display functions. Each SDD includes a docking port for selectively interfacing to a primary device docking port, and also includes a governor module. The governor module has an interface to determine if the SDD is docked to the primary device. The governor module permits the central display controller to determine local display functions in response to the SDD being docked with the primary device, or permits the local display controller to determine local display functions in response to the SDD not being docked.