## IE 4.0 : Browser Extension Mechanism

IE 4.0 allows programmers to add extensions to the browser or the desktop and this document gives you a quick overview of those extension mechanisms.

- BrowserBar extension: This mechanism allows programmers to add a band (an UI component which is hosted by an explorer bar, a communication bar or a deskbar) to the IE browser window.
- Browser Helper extension: This mechanism allows programmers to add a helper object (typically invisible) to each browser window to add some capabilities to the browser or perform some operations (such as monitoring user's navigation and etc.).
- Dicardable Browser Property: We enhanced the property mechanism of the browser so that programmers can easily pass data across page boundary.

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