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The DIAGNOSTICS LOWL_FILE_IO Server keyword logs low-level system errors into the Server status file, CTSTATUS.FCS. Although client applications have access to system errors through sysiocod, it is useful to see these errors logged on the Server side. For example, an end-user has problems opening a file. The end-user copied the data file from a CD-ROM onto the hard disk leaving the file marked “read-only”. When the user attempted to open these files, open errors were generated within the application. Adding the DIAGNOSTICS LOWL_FILE_IO keyword directed the Server to log the “not authorized” operating system error to CTSTATUS.FCS. This pointed the user to the “read-only” issue.
