Abstract: An application integrator that provides a user-interactive environment for integrating software applications having incompatible programming interfaces, such as production control and business enterprise systems. The application integrator generally comprises a configuration system that provides a user with a view of the software applications' name space and graphically represents user-determined associations between data units from each of the software applications. The graphical association represents a user-defined programmed interface, identifying which data units of the software applications to transfer and under what circumstances such transfers should occur. This information is stored by the configuration system in a configuration repository. A data server contains two distributed communication objects, each of which interfaces with a corresponding software application, and a mapping engine.