DMInternalApplication represents root DM2003 application object. Instance of this coclass is created internally in the DM2003.EXE at startup. Many DM2003 entities like action providers, minibrowser and MetaBase property page handler obtain references to this instance.
In the Browser, reference to the DM application object is available via window.external property. Action providers obtain reference in the DMApp parameter of IDMActionProvider.InitializeProvider method; property page handler object - in the DM parameter of IDMPropertySheet.Initialize method. In the HTML dialogs displayed by IDMApplication2.ShowDialog method, DM application object referenced by window.external.Server property.