code: def tagref(self, index):
          
  
          status, tag, ref = _C.Vgettagref(self._id, index)
          _checkErr('tagref', status, "illegal arguments")
          return tag, ref
docs: Get the tag and reference number of a vgroup member,
          given the index number of that member.
  
          Args::
  
            index   member index (0 based)
  
          Returns::
  
            2-element tuple:
              - member tag
              - member reference number
  
          C library equivalent : Vgettagref