Message area
In the message area, the message content which users need to check is output.
For details, refer to Messages.

When the message level is "W," "E," or "X," a detail error code may be output before the message content.
Normally, the error code of the OS is output, but it has a different meaning in the following cases:
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If an error occurs on the remote host
When an error occurs on the remote host, the error code of the remote host is output.
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If the child process error '721' occurs
If error '721' (child process error) occurs during Receive processing, Observe processing, or while using the Scheduler, the error code of the child process is output.