This tells inetd to run the codice_11 program, with the commandline: codice_12 (refer to the inetd.conf man page for information on the other arguments). The first argument contains the filename to be used for the log file: codice_13. inetd will run the service when needed, and attach port 9999 to the input and output streams, and all strings sent to that port will be logged to the file. By specifying wait, it tells inetd to only use one instance of the server to handle all requests.