update in set

[Olivier]

Hi,

I have one set.
I want to UPDATE, to add or to delete a record.
How can it be done?
I do not see methods (as in cursors) in the sets.
It is necessary to use directly the API methods (table1.field 
("string1") .setstring (" xxxx "), table1.updaterecord () ) ?
But in that case the set save the modifications at once?

Which is the difference between setIterator.value and arraySet.ItemAt ?

thank you

olivier