> # Message Categories

> The messages written to the primary and secondary log files can be generated by SequeLink Server or by the SequeLink Server DB2 service. Some messages provide information about events in various parts of the system; others report where errors have occurred.

> z/OS log messages are divided into sections and organized into the following message categories:

> - Operator Interface messages
> - SMF Interface messages
> - DB2 Application Interface messages
> - Multiplatform messages
> - Server controller messages
> - ThreadPool Interface messages
> - Resource Manager messages

> SequeLink errors are not logged in the log files. See "Overview of Error Codes and Messages" for more information about SequeLink Error Codes and Messages.