The scripting objects, also known as Xtra extensions, in Macromedia Director MX 2004 provide access to the functionality of the software components that are installed with Director and extend core Director functionary. The preexisting Xtra extensions provide capabilities such as importing filters and connecting to the Internet. If you know the C programming language, you can create your own custom Xtra extensions.
For an illustration of how the scripting objects relate to each other and to other objects in Director, see Object model diagrams.