Receives the IUnknown pointer of the browser.
接收ie浏览器的IUnknown指针。
But now we can also satisfy the requests for IUnknown by simply returning IDB.
但是现在，通过简单地返回IDB我们同样能够满足IUnknown的接口要求。
COM knows how to Marshall IUnknown, and when asked for a different interface, it looks under this key, finds the CLSID of the object that handles marshalling, and starts using it.
COM知道怎样编组IUnknow，且当请求不同的接口时，它会检查这个键，找到处理编组的CLSID，接着开始使用它。
COM knows how to Marshall IUnknown, and when asked for a different interface, it looks under this key, finds the CLSID of the object that handles marshalling, and starts using it.
COM知道怎样编组IUnknow，且当请求不同的接口时，它会检查这个键，找到处理编组的CLSID，接着开始使用它。
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