另一个例子，在调用宿主对象的函数时，如何进行类型强制转换，这也是没有规定的。

Another example is that it's not explained how types are coerced when calling functions on host objects. For example, when you do.

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step 3：新建的应用程序域创建宿主环境，如HttpRuntime对象。

Step 3: the newly created application domain creates hosting environment, i.e. the 'HttpRuntime' object.

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记住宿主的VBA代码被编译为p代码，而不是本机代码，这会导致性能略微有所下降，尽管在进程内运行能够优化对Office对象的方法调用。

Keep in mind that hosted VBA code is compiled to p-code, not native code, and this incurs a slight performance penalty, although running in process enables optimized method calls to Office objects.

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