I remember once finding some documentation on how AutoCAD handles the layer state in a viewport, but cannot find this reference. I've search through AutoCAD's documentation, to no avail. If I recall correctly, there is a DXF flag that has a set of bits that the user can manipulate for a given viewport. Does anyone have anything they can provide me on this subject? Also, if you have any LISP that would be useful, I would appreciate much! Thanks. Bruce