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Internet Explorer ShellInternet Explorer shell is a program (mostly web browser) that uses the Trident rendering engine of Internet Explorer. Some of the more popular Internet Explorer shells: These applications supplement some of Internet Explorer's usual user interface components for browsing, adding features such as popup blocking and tabbed browsing. Other applications, such as Intuit's Quicken and QuickBooks, AOL, Winamp, and RealPlayer, use the rendering engine to provide a limited-functionality "mini" browser within their own user interfaces. On Windows, components of Internet Explorer are also used in Windows Explorer, the operating system component that provides the default file-system browsing and desktop services. Trident engine is also used to render HTML portions of email messages in Microsoft Outlook and Outlook Express email clients. This integration, while convenient, is one of the most often exploited "back doors", since the Internet Explorer components make available more functionality to the HTML code than some feel should be permitted in the context of email messages, and Outlook and Outlook Express have, historically, not done enough to prevent malicious code from taking advantage of that functionality. The latest updates for Outlook Express, which require Windows XP and are distributed with Service Pack 2, are intended to improve this situation. Outlook 2003 already includes many of the updates. While all of these programs can customize Internet Explorer's user interface and extend the feature set, they cannot modify the rendering engine and are therefore subject to all of the benefits and the vulnerabilities of IE (including security holes and problematic rendering result). In addition to programs using Internet Explorers rendering engine, there are also programs that add extra features to Internet Explorer: See also
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