An object process graph (OPG) application development system. The system includes an OPG application program interface (API), an OPG application editor, an OPG application window editor, and an OPG application notation. The OPG API provides access to functions of an OPG system. The OPG application editor facilitates the creating and editing of the OPG applications via the OPG API. The OPG application window editor facilitates the editing of OPG application user interface windows while an OPG application is running. The OPG application notation includes a plurality of key words and associated definitions for describing and defining OPG applications.