The integration of multiple autonomous and heterogeneous database systems into one multidatabase system requires a powerful language which serves both for specifying queries and transactions. In our previous work we proposed a Prolog-based language for specifying queries in multidatabase systems. In this paper, we have introduced a parallel Prologbased query language which serves well as a concurrent specification language for the representation of a recently proposed transaction model called "Flex Transactions". We have described the extended language by using examples and have shown its advantages in comparison to existing parallel logic languages. A prototype implementation of this language (VPL Vienna Parallel Logic Language) has been developed at the University of Technology Vienna and is currently under investigation in the Interbase Project at Purdue University.