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XML User Interface Language (XUL)

XUL (pronounced “zool”) is Mozilla’s XML-based user interface language that lets you build feature rich cross-platform applications that can run connected to or disconnected from the Internet. These applications are easily customized with alternative text, graphics, and layout so they can be readily branded or localized for various markets. Web developers already familiar with Dynamic HTML (DHTML) will learn XUL quickly and can start building applications right away.

Combined it with XPCOM/XPConnect, which are complementary technologies that enable the integration of external libraries with XUL applications, it provides a very powerful and flexible development platform.

XPCOM, which stands for Cross Platform Component Object Model, is a framework for writing cross-platform, modular software. XPCOM components can be written in C, C++, and JavaScript, and they can be used from C, C++, JavaScript, Python, Java, and Perl.

XPConnect is a technology which enables simple interoperation between XPCOM and JavaScript. XPConnect allows JavaScript objects to transparently access and manipulate XPCOM objects. It also enables JavaScript objects to present XPCOM compliant interfaces to be called by XPCOM objects.

Together, XPCOM and XPConnect enable developers to create XUL applications that require the raw processing power of compiled languages (C/C++) or access to the underlying operating system.


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