ERP Connector uses two major functions provided by ESI services. The first function is the ESI Response Generator that works in tandem with the ESI Response Sender. The function allows Windchill java classes and Windchill workflows to generate one or more ESI response messages for the objects that were released for publication, and deliver them to the required destination. The second function is the Windchill ESI Windchill service. There are two standard Windchill services that implement methods that are useful to customizers and/or provide access to ERP ERP Connector functionality via the Windchill Adapter Apply-Service webject. One service provides methods that can be invoked from remote clients such as Windchill applet GUIs. The other service provides methods that can only be invoked from within the Windchill Method Server. These methods support the RPCs and provide generally useful services to support customization.