Receives the IUnknown pointer of the browser.

接收ie浏览器的IUnknown指针。

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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。

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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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