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The abstract architecture describes ORB interoperability in terms of the translation required when an object request traverses
domain boundaries. Conceptually, a mapping or bridging mechanism resides at the boundary between the domains, transforming
requests expressed in terms of one domain’s model into the model of the destination domain.
The concrete architecture identifies two approaches to inter-ORB bridging:
• At application level, allowing flexibility and portability.
• At ORB level, built into the ORB itself.