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In non-SAA/CUA applications it is assigned from bytes 478 to 479 of the system definition data area. Refer to the LANSA for i User Guide for full details of the System Definition Data Areas.
In SAA/CUA applications it is assigned from the partition level value assigned to the prompt function key. Refer to Steps to Create or Change a Partition in the LANSA for i User Guide for more details of how and when this value is assigned.