4 Examples   As mentioned above, a wide variety of different BES can be integrated rapidly into the system enabling an uniform usage of their services via the WWW. As examples of how to integrate BES and their functionalities, two different kinds of BES, namely the method base system PROGRESS and an XML-based monitoring system, will show the potential use of our middleware.   The Integration of the Method Base System PROGRESS The PROGRESS Application Object and the PROGRESS Input Component 4.1.2 Initialization 4.1.3 Handling of PAOs Within the Client The Integration of the XML-based Monitoring System SPECTO 4.2.1 Initialization of SPECTO's Application Logic SPECTO's Offline Application Logic - EventDatabase