I have been reading a few basic tutorials, and I recently purchased a copy of "operating system concepts 7th edition". Reading it though I am finding myself already lost quite quickly. I think I need a more basic starting point before I can get into the really technical stuff. Anybody have a suggestion of a good online tutorial, or a good book that will stop to explain in detail and simply how the operating system works? I don't want to know how to use my operating system (particularly windows), because I already get that. I want to understand it instead. Any suggestions would be great.