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              [html]<thead><tr><td>Method</td><td>Description</td></tr></thead><tbody><tr><td>AddRef</td><td>Increments the reference count.</td></tr><tr><td>QueryInterface</td><td>Returns pointers to supported interfaces. The add - in ’ s implementation of Queryhterface should support returning an IMsoDocExporter interface pointer from ID_IMsoPdWriter.</td></tr><tr><td>Release</td><td>Decrements the reference count.</td></tr></tbody>
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  For information about implementing the**IUnknown**interface methods, see IUnknown 
  
  (COM). 