Originally thought that GDI is just a collection of class libraries, not to see such a word from Microsoft's .NET 2003 online help documentation "GDI is a subsystem of Microsoft® Windows® XP operating system, responsible for screen and printer Display information. As the name suggests, GDI is a subsequent version of GDI (earlier version provided by Windows) .GDI is an Application Programming Interface (API), which is displayed by a class deployed as a hosted code. This set of classes "Managed Interface" called GDI . "
