Value-added Web services can implement any portion of the Connected Services Framework Well-enabled Service (WES) interface methods.
The Connected Services Framework Session component will work with almost any Web service (VAS), regardless of whether the WES interface has been implemented or not. The WES interface is important because it allows consistent orchestration (or driver) logic to be written for sessions that use participants that implement the WES interface.
This section introduces the ModifyState interface, which is a part of the WES interface. It also contains a sample Web service that implements the ModifyState interface: the VAS Participant sample.
Further information on VAS and WES development is available in the "Well-enabled Service Development Guide".