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

[detail level 12]

nds	All the classes and methods defined by the NDS3 framework are in the namespace nds
Base	This is the base class for all the NDS3 public classes that declare a device part (node, port, PV, etc)
DataAcquisition
NdsError	The base class for all the exceptions thrown by the library
StateMachineError	Base class for all the exceptions thrown by the StateMachine
StateMachineRollBack	The user implemented code should throw this exception from a state transition function to cause the state machine to roll back to the previous state
StateMachineNoSuchTransition	This exception is thrown by the StateMachine when a transition between 2 states cannot be executed because the transition does not exist
StateMachineTransitionDenied	This transition is thrown by the state machine when a delegated function reject the transition
TimeConversionError	This exception is thrown when there is an error in the conversion between the UNIX epoch and the EPICS epoch
NoPortDefinedError	This exception is thrown when there isn't any Port defined in the device structure. Without a Port there cannot be any communication with the control system
FactoryError	This is the base class for exceptions thrown by the NDS Factory. Usually it is thrown while allocating new control system structures
DirectoryNotFoundError	This exception is thrown when the folder being scanned for control system modules does not exist
DriverNotFound	This exception is thrown while creating a device when the requested device driver cannot be located
DriverAlreadyRegistered	This exception is thrown when a driver with the same name has already been registered
DriverDoesNotExportRegistrationFunctions	This exception is thrown when a loaded shared module containing a NDS device does not contain the export functions (see NDS_DEFINE_DRIVER)
Factory	Communicates with a static instance of the control system
PVVariableInImpl	Implementation of an input PV object that also stores the value so it does not need to delegate the read function
PVVariableOutImpl	Implementation of an output PV object that also stores the value so it does not need to delegate the read and write functions
FactoryBaseImpl	This is the base class for objects that interact with specific control systems and has to be allocated only once (singletons)
InterfaceBaseImpl	Represents the interface between NDS and the control system API
NodeImpl	Represents a node (channel or channelGroup in the old NDS) which can contain other nodes
PortImpl	Node that holds an ASYN port
PVActionImpl	Action PV. Delegates the read/write user defined functions and set the value back to the control system
PVBaseImpl	Base class for all the PVs
PVBaseInImpl	Base class for all the PVs
PVBaseOutImpl	Base class for all the output PVs
PVDelegateInImpl	Delegating Input PV. Delegates the read operation to an user defined function
PVDelegateOutImpl	Delegating Output PV. Delegates the read/write user defined functions
StateMachineImpl	Implements the state machine
IniFileParser	Parses an INI file and stores all the found sections and keys for future retrieval via getString()
Node	A node object that can contain other nodes or PVs as children
Port	Represents a node with direct connection with the controlled device
PVAction	An output PV that delegates the read and write operations to two external functions
PVBase	Base class for objects that process a single PV (or attribute in Tango parlance)
PVBaseIn	Represents an input PV
PVBaseOut	Represents an output PV
PVDelegateIn	An input PV that delegates the read operation to an external function
PVDelegateOut	An output PV that delegates the read and write operations to two external functions
PVVariableIn	An input PV object that also stores the value so it does not need to delegate the read function
PVVariableOut	An output PV object that also stores the value so it does not need to delegate the read and write functions
RegisterDevice	This is a class intended to be used as a static class for automatic registering of device supports
StateMachine	Represents a state machine to be attached to a node
Thread	Represents a thread