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State pattern and procedural solution illustrated
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SystemFramework defines interfaces, classes, and types to support a native runtime system with its own garbage collector, delegates, etc. The design of SystemFramework classes is similar to those of the .NET Framework.
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How to structure your Singletons.
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How to utilize WCF to allow a single instance of any WPF application without needing mutexes, extra assemblies, or special "hacks".