Have you ever had to create cooperating processes or threads as part of a school assignment, or for work, or some other outside project? If so, what did the processes/threads do and what kind(s) of data did you have to share among them? Did you use shared memory or message passing for communication of data? Why did you choose the approach you did? If you have never written cooperating processes/threads, try to imagine a situation where you might have to do so and discuss how you'd plan to implement the communications.