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COM Programming with Microsoft® .NET by Julian Templeman, John Paul Mueller

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Chapter 10. Creating Subscriptions

Just like COM applications, COM+ applications provide the means to react to events. In the world of COM, this technique is the request/reply system. COM+ uses the publish/subscribe system.

The two event-handling techniques share a few of the same concepts, but the implementation is essentially different. The problem with the request/reply system is that the client and server must know about each other—something that isn’t always possible when you’re working with distributed applications. In addition, when you’re using the request/reply system, the client and server must exist at the same time—again, a limitation when working with distributed applications. When you’re working with subscriptions, the server publishes ...

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