System messages fall into these categories:
Log messages record information about the processing run. These messages are informative rather than diagnostic. Types of information that fall into this category include transaction IDs that are processed; the start, ending and elapsed time of the run; transaction counts and statistics; and the program description that is producing the information.
Error messages are also informative, but usually help diagnose problems encountered during the processing run. These messages include such things as invalid data recognition; improper options; input/output errors; and resource validation.
The way these messages are produced is exactly the same. In general, the only real distinction between these two message classes is the destination file to which each is written.
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