Overview of the Listener and the Assist module
The IMS TCP/IP feature consists of 3 components: the IMS Listener, the IMS Assist module, and the Sockets Extended API. 1 The Sockets Extended API can either be used independently, or with the other 2 components. When the Sockets Extended interface is used independently, an IMS MPP can either serve as a client or as a server.
When the IMS Listener is used, the IMS MPP acts as a server, and the TCP/IP remote acts as the client. The Assist module is dependent upon the IMS Listener; therefore, when the Assist module is used, IMS is the server.
Because the Listener and the Assist module are designed to support IMS as a server, this information is based on that assumption. For a discussion of IMS as client, see When the client is an IMS MPP, and the sample program on Sample program - IMS MPP client.