EMA C++ RDM Usage Guide : 3 Login Domain : 3.2 Usage : 3.2.14 Login Ack Message
 
3.2.14 Login Ack Message
Open Message Model provider applications encode and send acknowledgment messages (AckMsg) to acknowledge the receipt of Post messages. This message is used whenever a consumer is posting off-stream and asks for acknowledgments. The acknowledgment contains a positive (ACK) or negative (NACK) code. For more details on posting, see the Enterprise Message API C++ Edition Developers Guide.