How can SAP tRFC server tell client through JCo that function carried out?

SAPs "Transactional RFC Technical Description" document (release 4.0) says in section Transactional RFC on page 6: "Finally, the server tells the client, that the function has been carried out and the client acknowledges this.".
How can the server tell this to the client when the server communicates with the client through JCo (Java Connector)?

System.out.println goes to console, which is not a file... This whole thing is much easier if you use standard logging:
http://help.sap.com/saphelp_nw04/helpdata/en/d2/5c830ca67fd842b2e87b0c341c64cd/frameset.htm

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