| Interface | Description | 
|---|---|
| UDFFinder | Common interface for "Add-in" libraries and user defined function libraries. | 
| Class | Description | 
|---|---|
| AggregatingUDFFinder | Collects add-in libraries and VB macro functions together into one UDF finder | 
| DefaultUDFFinder | Default UDF finder - for adding your own user defined functions. | 
| IndexedUDFFinder | A UDFFinder that can retrieve functions both by name and by fake index. | 
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