AutoCAD 2006 introduced a context-sensitive dashboard. When you clicked a line, the dashboard changed to line tools; when you clicked a hatch, it changed to hatch tools. This was the evolutionary step before the full Ribbon UI in AutoCAD 2009.
The activation process typically involves: Autocad 2006 with key full version
When Autodesk released version 2006, they introduced tools that are now standard but were mind-blowing at the time. AutoCAD 2006 introduced a context-sensitive dashboard
If you need AutoCAD 2006 functionality but cannot afford a modern license or cannot find your old key, consider these legal alternatives: the dashboard changed to line tools