A message queue exists for every call stack entry within each iSeries job. This is known as a call message queue. As soon as a new entry appears in the call stack, the system creates a new call message queue. In ILE C/C++, the name of the procedure identifies the call message queue. If the procedure names are not unique, you can specify the module name, program name, or service program as well. If you determine that your handler does not recognize an exception message, the exception message can be percolated to the next handler.
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