Most Dreamweaver extensions are written in HTML and JavaScript. This guide assumes that you are familiar with Dreamweaver, HTML, XML, and JavaScript programming. If you are implementing C extensions, the guide assumes that you know how to create and use C dynamic link libraries (DLLs). If you are writing extensions for building web applications, you should also be familiar with server-side scripting on at least one platform, such as Active Server Pages (ASP), ASP.NET, PHP: Hypertext Preprocessor (PHP), Adobe® ColdFusion®, or JavaServer Pages (JSP).