Windows
GtkRoot
— Interface for root widgets
GtkNative
— Interface for widgets having surfaces
GtkWindow
— Toplevel which can contain other widgets
GtkDialog
— Create popup windows
GtkMessageDialog
— A convenient message window
GtkAboutDialog
— Display information about an application
GtkAssistant
— A widget used to guide users through multi-step operations
GtkWindowGroup
— Limit the effect of grabs
GtkNativeDialog
— Integrate with native dialogs