使用者与逻辑总线进行通信，而后者跟踪来自提供者的可用服务，并负责调用恰当的提供者。
The consumers communicate with the logical bus, which keeps track of the available services from the providers, and in turn calls the appropriate provider.
如果该目标不可用，则尝试连接到相同总线中运行的任意消息传递引擎。
If that target is not available then try to connect to any messaging engine that is running in the same bus.
将显示可用总线的列表，如图9中所示。
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