public static Records Reverse ( Records RB )
    {
    Record res = new Records();   // For the result.
    Records temp = RB;
    while ( !temp.IsEmpty() )
      {
      res.AddHead(temp.GetHeadDatum(),temp.GetHeadKey());
      temp = temp.GetTail(); 
      };
    return res;
    }
  //***********************************************************************
  public static Records Concatenate ( Records Start, Records End)
    {
    Records res = new Records();
    Records temp = new Records();
    Records StartPoint = Start;
    Records EndPoint = End;
    // Build the first part by stacking the Start
    while (!StartPoint.IsEmpty())
      {
      temp.AddHead(StartPoint.GetHeadDatum(),StartPoint.GetHeadKey());
      StartPoint = StartPoint.GetTail();
      };
    // Stack the End onto the list just built.
    while (!EndPoint.IsEmpty())
      {
      temp.AddHead(EndPoint.GetHeadDatum(),EndPoint.GetHeadKey());
      EndPoint = EndPoint.GetTail();
      };
    res = Reverse(temp);
    return res;
    }