The following control changes appearance when a file named report is placed in the /doc/ftp/pub/ directory. When the file is not there, the NoReport.pm icon is displayed; when the file is there, Report.pm is displayed.
CONTROL MonitorReport
{
CONTAINER_NAME container_name
TYPE ICON
MONITOR_TYPE file
FILE_NAME /doc/ftp/pub/report
ICON NoReport
ALTERNATE_ICON Report
}