The GO (Graphical Objects) library was located in $usepop/pop/lib/proto/ However the package has never worked properly, because funding for the project ran out before it was finished. It has therefore been removed from the Poplog distribution. It is available if needed here http://www.cs.bham.ac.uk/research/projects/poplog/packages/go.tar.gz 199002 Bytes Feel free to try to fix it. Aaron Sloman http://www.cs.bham.ac.uk/~axs 3 Jul 2009