Hi, sorry, I can't give you a new ROI spec. But I want to mention the following article (maybe you've already know it): "An Architectural Overview of QNX" by: Dan Hildebrand available via anon-ftp from ftp.cse.ucsc.edu:/pub/qnx-paper.ps.Z in there you will find a description of a real micro- kernel based OS, though not object-orientated. Enjoy! Peter