EMA C++ RDM Usage Guide : 3 Login Domain : 3.4 Special Semantics : 3.4.2 Initial Login
 
3.4.2 Initial Login
An Enterprise Message API Consumer sends a login request to an Open Message Model Provider application on behalf of users who are using login attributes specified in OmmConsumerConfig. Users can register to get a login handle to receive a login status or use the login handle to reissue and post messages on a login stream.