Answer / Sunil Kumar Jayasawal

To write a publish-subscribe (pub/sub) model application, follow these steps: 1. Define IDL interfaces for the topics and services provided and required by the communicating objects. 2. Compile the IDL files to generate corresponding stubs and skeletons. 3. Implement the topic publishers and subscribers using the generated stubs and skeletons. 4. Create an ORB instance and initialize it with necessary properties. 5. Register the topic publishers with the ORB. 6. The clients can then subscribe to one or more topics, and the publishers will automatically notify the subscribed clients when a new message is published.

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