Dave, I am slowly gathering ideas on how to write an interface to gnuplot. It will probably be enough to use PipeableOSPRocess class>>command: to grab output from it, but it will be inefficient for producing large numbers of graphs. Ideally, I would like to run the program and obtain output without creating so much as a named pipe; it appears to be possible to route output to standard out, so there is a potential for it to work. For a single graph, think I see how to make that go. For large numbers of graphs, one could allow gnuplot to write the files; that might even be preferred in many situations, but right now I appear to be designing that way because I don't know another way - I'm trying to leave Windows behind me :) Is there a clean way to start gnuplot, leave it running, write to its stdin, read from its stdout almost as if it were a TCP server, and then close it when I'm ready to do so? I tried running CommandShell thinking that might let me demo it, but appears to be stuck back in MVC?? Bill