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    public interface ITravelLogStg

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    public static Guid IID_ITravelLogStg = new Guid("7EBFDD80-AD18-11d3-A4C5-00C04F72D6B8");

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        //QueryService for ITravelLogStg

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        int hr = psp.QueryService(ref SID_STravelLogCursor, ref IID_ITravelLogStg, out oret);

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        ITravelLogStg tlstg = Marshal.GetObjectForIUnknown(oret) as ITravelLogStg;

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Public Interface ITravelLogStg

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Documentation

[ITravelLogStg] on MSDN