($type, $value) =
  $session->invoke_t( $object, $operation [, @arguments]

The invoke_t() function is identical to invoke() except that the return indicates both the type and the value of the returned data.

The value is a Perl scalar, if the operation returns a scalar, or an array reference, if the operation returns an array. The type will contain one of the Domain Manager internal type codes. For example, “13” is the code for a string.