Band name jokes aside, the who DSC refers to is any target node. Why the separation and distinction? Well, as explained in the MOF earlier, we aren't dealing with just Windows servers. We could possibly be dealing with network switches, Linux servers, storage devices, and so on; the list potentially includes any device in your environment. By setting target node definitions in a structured way, we can describe the nodes in ways that make sense to anyone reading the configurations, as well as the computer's processing the configurations.