Hi Christian,
>
>I want to set indexes programmatically.
>How do I set an index on DELETED()?
>
>I try INDEX ON Deleted() TAG Deleted().
>
>It won't accept this tagname, but in Modify Structure I can use the tag name Deleted(). Should I leave the () away or is there another way?

As you discovered, you cannot name it with the (). I'm surprised Modify Structure allows it (BUG). When I index on deleted() I name the tag deletes.
HTH,