How to add Custom Properties to objects in AutoCAD?

Hi

Is there any (non programming) solution where I can add custom data/properties to objects in plain AutoCAD?

(I know I can in Civil 3D though, using Notes/Extended Properties etc etc)

We want to allow users to add their own unique ID to all their drawn objects, and we don't want to use Entity Handle as that is not anything we can choose  ;-)

We're using that ID to connect other datasources (ODBC) to Navisworks and we would like it to work even from AutoCAD, even though we have Civil 3D inhouse.

Any ideas, using plain AutoCAD straight out of the box?

All the best  // Ove Cervin