procedure TForm1.Button1Click(Sender: TObject);
var
Registro: TRegistry;
begin
Registro := TRegistry.Create;
Registro.RootKey := HKEY_LOCAL_MACHINE;
Registro.OpenKey( 'SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon', False );
Label1.Caption := Registro.ReadString( 'DefaultUserName' );
Registro.CloseKey;
Registro.Destroy;
end;
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