I added an example ("Adding Command-line Commands") to Chimera's programmer examples describing how to add your own commands to Chimera's command-line interpreter. The functionality described in the example will not be available until the next Chimera release, in 2-6 weeks. The programming examples are at http://www.cgl.ucsf.edu/chimera/docs/ProgrammersGuide/Examples/ index.html Eric Pettersen UCSF Computer Graphics Lab pett@cgl.ucsf.edu http://www.cgl.ucsf.edu