This is useful if the operator knows that a particular message belongs in a certain location in spite of the checksum status. Locked messages are fixed and additional messages for that location are ignored if they are encounterd. This will allow the unmodified set of follow-on processing code to be used. Fwrite can also be invoked manually. You may need to modify the routines for accessing the command line.
Every write statement writes a single record.
Any portability between such files is a coincidence and should not be counted upon.