After serious thinking Tim Childs wrote :
many thanks for comprehensive answer - I hope you are not despairing (of
me!). I had not spot that (IMHO subtle) difference in the Helpfile about the
arguments

No problem, Tim! Though I won't declare that the built-in Help is the
last word on anything since it's often useless when it comes to some of
its examples/explanations. Thankfully that's on the lesser side of
things as Help is usually the 1st place I look for answers. Working
examples is 2nd place.

--
Garry

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