Generic Video Configuration Interface

The Video Configuration Manager supports a generic video configuration 
interface that allows any display driver to interface with the user via 
notebook settings in the System icon. The driver needs to export DevEscape 
calls that identify the capability. The driver also needs to provide 
DevEscape calls that allow the VIDEOCFG to query the current value and 
notify the driver when the user sets the value. The DevEscape functions 
are invoked as Ring3. The method of recording the current setting, as well 
as default values, is at the driver's discretion.