The distribution target assignment user interface is described in the Windchill Enterprise Systems Integration User's Guide. Windchill ESI distribution target UI is developed using PTC’s MVC based Client Architecture, which requests for data and services by invoking Info*Engine tasks (that make use of Windchill Adapter webjects) and certain Java APIs. The functionality that associates distribution targets calls an appropriate method on the StandardESIService class (see the Windchill ESI Windchill Service section of this document for details). Class StandardESIService in turn delegates all the work pertaining to distribution targets to an instance of ESITargetUtility (see the ESITarget section of this document for details).