How to use the registry

uses
  Registry;

procedure TForm1.Button1Click(Sender: TObject);
var
  reg: TRegistry;
begin
  // Creates a TRegistry Object, erzeugt ein a TRegistry Objekt
  reg := TRegistry.Create;
  try
    // set the the Mainkey, bestimmt den Hauptschlüssel
    reg.RootKey := HKEY_LOCAL_MACHINE;
    // Open a key, den Schlüssel öffnen
    reg.OpenKey('Software\siro_com', True);
    // Save a string value, speichert einen String-Wert
    reg.WriteString('Test string', 'Test');
    // Close the key, Schlüssel schliessen
    reg.CloseKey;
  finally
    // and free the TRegistry Object, das TRegistry Objekt freigeben
    reg.Free;
  end;
end;