相同的包装函式会完全公开五个介面。
可连接物件(即来源)可以公开本身的介面或任何输出介面的连接点。
A connectable object (that is, a source) can expose a connection point for its own interfaces or for any outgoing interface.
自订封送处理也能让建置来配合新介面使用的用户端，能够配合公开旧介面的伺服器使用。
Custom marshaling also enables clients built to work with a new interface to work with servers that expose the old interface.
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