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# Main Window and Related Classes

These classes provide everything you need for a typical modern main application window, like the main window itself, menu and tool bars, a statusbar, etc.

QAction | Abstract user interface action that can be inserted into widgets with QWidget::addAction()
QActionGroup | Groups actions together
QApplication | Manages the GUI application's control flow and main settings
QCoreApplication | Event loop for Qt applications
QDockWindow | Widget that can be docked inside a QMainWindow or floated as a top-level window on the desktop
QEventLoop | Manages Qt's event queue, excluding GUI-related events
QMainWindow | Main application window
QMenu | Menu widget for use in menu bars, context menus, and other popup menus
QMenuBar | Horizontal menu bar
QSessionManager | Access to the session manager
QSizeGrip | Corner-grip for resizing a top-level window
QStatusBar | Horizontal bar suitable for presenting status information
QToolBar | Movable panel that contains a set of controls
QWorkspace | Workspace window that be used in an MDI application