使用Client程序调用服务。

The invoke the service using the Client program.

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此外，一个应用程序可以对另一个应用程序调用服务来通知其更改情况，但是这种方法有三个问题。

Again, one application can invoke a service on another application to inform it of a change, but there are three problems with this approach.

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接下来调用评测处理程序来记录服务调用的启动，之后，记录它的结束。

The metering handler is then called to record the service invocation start, and later, its completion.

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