How to define the Key in the sort method of a range

[stranno]

hello,
What is the best definition of the key in: ActiveSheet.Sort.SortFields.Add Key:= …..
if all the assigned keys in the attached workbook give the same result?
How should i interprete the key in this regard?
And what is the use of .SortFields.Clear?
It seems to make no difference at all.
After all, the sort method is applied on a given (current) state of a range.
Sorted or unsorted.

regards,
Stranno