Abstract: Apparatus for integrating independent computer systems with associated heterogeneous data bases having some common or shared data entities. The apparatus includes an update capturing module installed at each of the computer systems, for capturing update transactions involving shared data entities, and a central data translator, which receives the updates from the update capturing modules, translates the updates into appropriate record formats and data base schemas, and transmits the translated replicas to the appropriate separate computer systems, where the updates are directly or indirectly entered into the corresponding data bases, thereby ensuring consistency among the separate but related data bases.