EMA C++ RDM Usage Guide : 4 Source Directory Domain : 4.4 Special Semantics : 4.4.4 Service and Group Status Values : 4.4.4.1 Service Status
 
4.4.4.1 Service Status
Providers can use a directory’s ServiceState.Status element to efficiently change the state of all of a service’s existing streams with a single message. The ServiceState.Status does not apply to requests that are currently pending a first refresh or status response (for details, refer to Section 2.3) message. Enterprise Message API consumer implementation normally fans out state from the Status Element to all items associated with the service. When Enterprise Message API does this, it will not forward this Element to the application. Instead, the application receives a StatusMsg for each item from the service. The other elements from the ServiceState FilterEntry will still be sent to the application.