Hi; I have been reading some manuals about Operating Systems / Linux but I have been left unclear about some things that are being written. >From Modern Operating Systems - Tannenbaum "Two different solutions were developed for structuring and modularizing the character drivers." He goes on to describe the BSD solution and the System V solution. He and other authors are not clear on whether Linux uses one or the other solution, or, whether Linux uses both -- BSD with C-Lists and line discipline for keyboard, mouse etc. input; and, Monitor and printer output -- while the System V solution is used for things like networking. The above seems to be how things are organized, but I would just like some confirmation. I have lots of info to study, if I can feel confident I am going in the right direction. Read that as I only need a short answer. I can get fuller explanations from the manuals I have. Regards Bill