Using the customization tools of AutoCAD, you can tailor your drawing environment to suit your needs. Customization capabilities, including the customize (CUIx) file format and the Customize User Interface (CUI) Editor, help you to easily create and modify customized content.
You customize the XML-based CUIx file with the Customize User Interface (CUI) Editor to create new commands, user interface elements, and workspaces.
Although the basic customization techniques remain the same as in previous versions of the product, the environment that you use to customize the product was changed starting with AutoCAD 2006.