A CA Is a Provider of Services
A CA exists for a reason. It provides the interface between the IBA fabric and back-end logic designed to provide one or more types of services to other entities. In this context, it can be thought of as a Server. This concept breeds a series of questions:
How do other entities (CAs acting as Clients, so to speak) issue requests to a CA? The answer is: by passing messages to it.
How does the CA supply the results back to the client CA? The answer is: by sending it messages.
How are messages passed between the two? As we already know, messages are exchanged using QPs within the two CAs.
If a CA provides more than one type of service to its clients, then it probably provides each specific type of service through a specific ...
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