On Fri, 10 Nov 2006 13:50:38 -0600 > How about one of them was a real-time version of Linux, called Blue Hat? > Marketed by, of all companies, Red Hat. Do you suppose that this is > perhaps somewhat similar to the current topic of discussion? Not really. I was talking about things that exist. I can point you at Linux OS's with a stable binary kABI - they're all basically Red Hat or SuSE Enterprise Linux products repackaged, because the work is too hard to do randomly. Alan