First let me apologize for asking without properly evaluating first. I took some time and read about Nautilus which it seems a very nice work. I've developed a phylogenetics classifier using OmniBrowser, but I wondered if Nautilus could save me some effort, and I'm planning to test Pharo 1.4 or 2.0 in some future in which AFAIK OmniBrowser will not be supported anymore. - Some time ago I've modified the OmniBrowser framework to browse anything I wanted in the "code pane" (the lower pane typically used for displaying/editing code), as we had a complex OODB it was very useful, see http://www.youtube.com/watch?v=VxUaOFRHFPk for a demo. However it was not easy to understand the OB internals and make the modifications. Have you tried to implement such feature in Nautilus? - There is documentation for developing browsers with Nautilus? Something which explains the basic architecture, how it differs from OB? for example: --Do you have to define a metagraph? --May I have multiple definition panels? -Do you have a mapping for each node type (class?) with each column? -OB is not cross-UI (it depends on Morphic). Can I use a Nautilus browser within a web browser? - Another thing which is really easy is to define Commands in OB, (although the #isActive logic could become a mess without some care). How it is different in Nautilus? I'm sure I would rewrite my browsers with Nautilus, my key question is how much of the OB knowledge I can re-use? Cheers, Hernán -- Hernán Morales Institute of Veterinary Genetics. National Scientific and Technical Research Council (CONICET). La Plata (1900), Buenos Aires, Argentina. Telephone: +54 (0221) 421-1799. Internal: 422 Fax: 425-7980 or 421-1799.