| StreamBegin read/write property Sets
          the actual stream begin at the desired position. As result the part of
          the stream before the specified position is skipped if only Filter
          supplied or SFRecord supplied navigation methods are used. Can be
          extremely useful if the file contains headers with different structure
          (one well-known example are DBF files). 
        Syntax:
        
          object.StreamBegin = numeric_value 
          variable = object.StreamBegin 
         
        Parameters:
          
            The position is integer value in bytes from the beginning of the
            stream 
           
        Remarks:
        
          See the Seek method - it supplies the same functionality like
          SFStream.Seek but its base unit is the filter's buffer size (the
          Record size if used with SFRecord) and also the StreamBegin takes
          effect and acts as virtual beginning of the stream. 
         
        Applies to:  SFFilter object 
          Supported on: 
          
            Windows 95/NT and later 
            Windows CE 3.0 and later 
            Pocket PC/Windows Mobile 2003 and later 
            Windows CE.NET 4 and later 
           
          
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