Types of messages

There are a variety of system and server messages available to assist you, ranging from error messages, to printer messages, to alerts.

The system is shipped with the IBM-supplied message files, stored in the system library, QSYS: the CPF message file, QCPFMSG (for the i5/OS™ system and machine interface messages); and the licensed program message files, such as QRPGMSG (for RPG messages). It is important before you handle messages to understand the message types:
Related reference
CL Programming