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Hi Charles, <snip> I think it depends on what happens to be in memory at a particular location. </snip> My understanding is that passing *OMIT into the procedure in place of an omittable parm would set the address to null. If it didn't then *OMIT is a waste of time. For example, if you could omit ONLY the fourth of seven parms you've got no way of checking if it's passed without checking it's address - referencing the variable directly will cause an exception if it actually was omitted. Cheers Larry Ducie
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