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dtSearch Text Retrieval Engine Programmer's Reference
ISearchResults::SetSortKey Method
HRESULT SetSortKey(BSTR newKey);

Specify the string value to use when sorting search results.

When Sort() is called with the dtsSortBySortKey flag, the search results list will be sorted according the value set, for each item in search results, using SetSortKey. SetSortKey is useful when the sort must be done based on a computed combination of more than one field.

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