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A SmartGrid.NET Grid is set of SmartGrid.NET Nodes.

Each Node hosts one or more application AppDomains. Each application AppDomain hosts application assemblies.

The set of assemblies hosted within a SmartGrid.NET Grid constitutes a Grid application.

A SmartGrid.NET Node will host whatever .NET application code it is instructed to host. Any given Node can by turns host different application code or different versions of the same code.