The principal application code constructs that are normally invoked under the application execution context are:
- Modeless dialog boxes posted by ObjectARX applications, or any DLL loaded by AutoCAD.
- All ObjectARX service calls made from the application context, including any ObjectARX-defined callouts that can be triggered from them, including custom object and entity virtual members, AcDb*, AcRx* reactor members, and AcEditorReactor members concerning database objects.