This lecture will provide an introduction to operating system organizations, monolythic, microkernel, etc. The assigned paper describes the exokernel organization. The JOS operating system you build in lab is organized like an exokernel.
Assignment: read the exokernel paper and try to understand as well as you can. Don't worry if you don't get the paper now. It will give you a good idea of what the end result of the labs will be, and by the end of the semester you will understand this paper very well.