CobraCore is a class within Cobra's standard library (known as "Cobra.Core"). It is immediately accessible in Cobra code and contains numerous `shared` methods for various utility functions. 

You can browse the source online to see the method signatures along with their doc strings, contracts and unit tests: http://cobra-language.com/trac/cobra/browser/cobra/trunk/Source/Cobra.Core/CobraCore.cobra

See also: LibraryTopics, EncodeAndDecode