TRichEdit

Code:

procedure TForm1.Button1Click(Sender: TObject);

var

MemoryStream:TMemoryStream;

begin

MemoryStream:=TMemoryStream.Create;

try

   RichEdit1.Lines.SaveToStream(MemoryStream);

   MemoryStream.Seek(0,soFromBeginning);

   RichEdit2.Lines.LoadFromStream(MemoryStream);

finally

   MemoryStream.Free;

end;

end;