Plus, among the predefined types of objects that the ATL COM Wizard natively supports, there's one, the Internet Explorer Object, that is just the type of object a BHO should be.

另外，在ATL COM 向导本地支持的已定义好的对象类型当中，有一个，就是Internet Explorer对象，这正是一个BHO应该具有的类型。

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So when you write Ajax applications that need to work on Internet Explorer, you need to create the object in a particular way.

因此如果编写的Ajax应用程序要和Internet Explorer打交道，那么必须用一种特殊的方式创建对象。

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However, older browsers such as Internet Explorer 6 require that you create an ActiveX object to perform asynchronous calls to the server.

但是，Internet Explorer 6等比较陈旧的浏览器要求创建一个ActiveX对象来执行异步的服务器调用。

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"The initial program installed itself as a browser helper object (BHO) for Internet Explorer that downloaded a component from childhe.com and attempted to trick the victim into installing a fake anti-virus scanner from bestantispyware securityscan.com and protectionsoft warecheck.com, " he explained.

BBC: Hackers website