Browser

Today's Web sites are another matter, however. Gone are the static pages and limited graphics of 15 years ago. In their place are lush, highly interactive experiences, as visually rich as any desktop application. The Web has become the preferred platform for enterprise application delivery, to say nothing of online entertainment and social software. In response, new kinds of online experiences have begun to emerge, challenging old notions of what it means to browse the Web.

Take Twhirl, a desktop client for the Twitter online service. Double-click its icon and the application launches in seconds. Its window is small and stylized, with an attractive, irregular border and configurable color schemes. What few controls it has are convenient and easy to use. It's sleek, fast, and unobtrusive. In short, it's everything that navigating to the Twitter Web site with a browser is not.

But don't be fooled. Although it looks and feels like an ordinary desktop application, Twhirl's UI is rendered with HTML, CSS, Flash, and ActionScript. Essentially, it's a Web app.

Twhirl is built on Adobe AIR, which has a lightweight client library that allows Web developers to use familiar tools and languages to build first-class desktop applications. Software created with AIR is fully interactive and network-enabled, with a rich UI. But unlike traditional Web applications, AIR apps gain the immediacy and user engagement that come from running outside the browser window.

[ For an in-depth look at rich Web frameworks, see our reviews of Adobe AIR, Microsoft Silverlight, Curl, WaveMaker Visual Ajax, open source AJAX toolkits, and other rich Web development tools. ]

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