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This recipe describes a single-server WSUS deployment, but WSUS also runs on multiple servers to support large networks, can synchronize from other WSUS servers on the network, can use web proxies, and can work with SQL Server instead of the Windows Internal Database.
WSUS server requirements and deployment scenarios are documented on technet at https://technet.microsoft.com/en-us/library/hh852344(v=ws.11).aspx#BKMK_1.1.
While the UpdateServices module is very useful, most of the tasks you perform in PowerShell to administer WSUS involve accessing the UpdateServer and Subscription objects directly.
MSDN contains documentation on these objects under the Microsoft.UpdateServices.Administration namespace.
Explore the documentation at https://msdn.microsoft.com/en-us/library/windows/desktop/microsoft.updateservices.administration(v=vs.85).aspx to understand the available methods and properties.