This section includes summarized list of all classes that provide basic core implementations and being abstract have no visual representation.

Class Name	Description
QControl	This class serves as a base abstraction for all "interactive" classes (including user-defined ones).
QWndCtrl	This is a base class for all window controls such as: popup boxes, control panels, tab controls, popup menus etc.
QBoxCtrl	It's a base abstraction for all "box" controls. Box is a special kind of window that has graphics border around the client area.