Icons are small (typically not more than 32-by-32 pixels) images augmented with a transparency mask. They are often used in user interface (UI) components such as buttons and labels, as well as in UI operations such as drag-and-drop. The class CgIcon represents an icon in Common Graphics. CgIcon objects can be created using application-defined data, by loading from a dynamic link library (DLL), by specifying a system icon constant, or by specifying an operating system (OS) icon representation.