The file tail front endis designed to read the log files of long-running Domain Managers. All of the characteristics of the file front end are present in the file tail front end. Unlike the file front end, however, the file tail front end does not simply open the file, read its contents, and then terminate. Rather it opens the file, seeks to the end of the file, and waits for additional lines to be written to the end of the file. As new lines appear, the front end feeds them to the rule set. The --tail option of the sm_adapter command invokes this front end.