EMA C++ RDM Usage Guide : 2 Domain Model Overview : 2.6 General Enterprise Message API Concepts : 2.6.5 Batch Request
 
2.6.5 Batch Request
A batch request allows a consumer application to indicate interest in multiple like-item streams with a single ReqMsg. A providing application should respond by providing a status on the batch request stream itself and with new individual item streams for each item requested in the batch. Batch requesting can be leveraged across all non-administrative domain model types. The provider indicates its support for batch requests via the supportBatchRequests Login attribute, as described in Section 3.3.1. For more information on batch requests, refer to the Enterprise Message API C++ Edition Developers Guide.