You use the IXCSRVR service to define a server to receive, process, and send responses to requests from clients. When defining a server, you must provide a server exit routine for XCF to call to process requests. When the server finishes processing the request, it uses the IXCSEND macro to send the response with the request results back to the client. The client then uses the IXCRECV macro to receive the response provided by the server.