Just a side note: as Darrell mentioned: "Log message that has View = Yes". and this concern only the output information, not the complete system log record. Probably the most common is output of "arsload -v" or "arsmaint", but there are others as well.
However, all other (complete) information found in System log is *DB only*.
With a help of "arslog - OnDemand User Exit Logging Facility" you could push the messages to a file.
Cheers,
N.