Here are the classes, structs, unions and interfaces with brief descriptions:

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Nxronos
Nsdk	Main Xronos SDK namespace
CBaseReaction	Base class for implementing reactions
CMetricEffect	Allows a reaction to record telemetry data using a given Metric
CPortEffect	Allows a reaction to write data to a given Port
CProgrammableTimerEffect	Allows a reaction to schedule future events using a ProgrammableTimer
CShutdownEffect	Allows a reaction to terminate the program
CTrigger	Declares a reaction trigger and provides read access to the triggering EventSource
CDefaultRuntimeProvider	A runtime provider that provides the default runtime
CElement	Base class for all reactor elements
CEnvironment	The entry point for assembling and executing reactor programs
CEnvironmentContext	Opaque data type used for constructing reactors
CInputPort	A reactor element for receiving messages from other reactors
CMetric	A reactor element for recording metric data to an external data base
COutputPort	A reactor element for sending messages to other reactors
CPeriodicTimer	A reactor element that emits events in regular intervals
CPhysicalEvent	A reactor element for receiving events from external sources
CPort
CProgrammableTimer	A reactor element for scheduling new events
CReaction	Reaction base class with reactor access
CReactionContext	Opaque data type used for constructing reaction triggers and effects Reaction effect classes.
CReactionProperties	Opaque data type used for constructing reactions
CReactor	An abstract reactor that can be subclassed to define new reactors
CReactorContext	Opaque data type used for constructing Elements
CRuntimeProvider	Abstract interface for providing a concrete runtime instance
CShutdown	A reactor element that emits an event right before the program shuts down
CStartup	A reactor element that emits an event when the program starts up
CTestEnvironment	A variant of the environment that is configured for testing
CValidationError	Exception that is thrown when a program reaches an invalid state