LabVIEW can handle both strings and numerics return parameters but there isn't a return for booleans. I am not great at other programing languages, but I think many times the boolean variable is a numeric (0 or 1 for False and True). If this is not the case, then the best way to get this value into LabVIEW would be to write a wrapper DLL that would convert the boolean value to a numeric that LabVIEW could handle.