Part Description Files - A Few Questions..

Hi,

I'm just exploring some different configurations with part descriptions (free descriptions, etc).  Got a few questions:

1.  Is it possible to edit a description without changing the layer?  I can assign a desription and the part will stay on the same layer.  But if I change the description to 'none', the layer will revert to default ProSteel layer (PS_Shape or PS_Plate, etc).

2.  In the 'Files' tab of global settings - what are the 'Working Description' and 'Origin Descripions' config files?  These files are blank in my installation.

Thanks for any help