nanoCAD uses the DWG file format, which means it can open and edit drawing files from many other CAD programs. One quirk about DWG is that it can define custom objects that are unique to one program. When you open such a drawing in nanoCAD, the custom objects are displayed as proxies -- entities that can be seen but not edited very much. In this video, you learn how to work with proxy objects: • Identifying which objects are proxy objects • Changing the look of proxy objects with the ProxyShow variable