The Human Interface Toolbox is a set of APIs for modern Carbon. It replaces or encompasses the older Control Manager.

Apple's Developer Site provides documentation and sample code. [Human Interface Toolbox]

HIObject provides the base class for the objects in this toolbox. Controls, Windows and Menus are derived from this base class.

HiObjectBase class for other Human Interface objects
HIViewVisible Human Interface controls
Data BrowserDisplaying data
Menu ManagerStandard Menus, Pop-up Menus, & Custom Menus
Control ManagerButtons, Check Boxes, Radio Buttons, Text Boxes, etc.
Dialog ManagerAlerts, Dialogs
List ManagerDisplaying lists
Appearance Managerthe look of the standard interface
Finder Interfaceinformation about file system objects
Icon Servicesmanipulating and drawing icons
HIShapeWill replace QuickDraw Regions
HIArchiveStoring and retrieving data
HIToolbarToolbar view
HIScrollViewScrolling view