code: def initQApplication():
      
      # PyQtGraph recommends raster graphics system for OS-X.
      if 'darwin' in sys.platform:
          graphicsSystem = "raster" # raster, native or opengl
          os.environ.setdefault('QT_GRAPHICSSYSTEM', graphicsSystem)
          logger.info("Setting QT_GRAPHICSSYSTEM to: {}".format(graphicsSystem))
  
      app = QtWidgets.QApplication(sys.argv)
      initArgosApplicationSettings(app)
      return app
docs: Initializes the QtWidgets.QApplication instance. Creates one if it doesn't exist.
  
          Sets Argos specific attributes, such as the OrganizationName, so that the application
          persistent settings are read/written to the correct settings file/winreg. It is therefore
          important to call this function at startup. The ArgosApplication constructor does this.
  
          Returns the application.