GRASS and Intergraph

Anyone using Intergraph designs file in grass:
  We have just started using grass at our site. Our CAD applications
are Microstation 4.0 and IGDS (VAX). I would like to compare notes with
anyone with similar circumstances. Topics I am especially interested in are
1) importing .dgn files into grass
2) how the .dgn files are setup to facilitate importation into GRASS.

Thanks,

Allan Axon
Ohio Geological Survey
4383 Fountain Square Dr.
Columbus, OH 43224
614-265-1030