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

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Pothos
serialization
System
NumaInfo
Logger
HostInfo
Util
OrderedQueue
SpinLock
UID
RingDeque
CompilerArgs
Compiler
EvalInterface
RefHolder
TestingBase
Exception
LogicException
AssertionViolationException
NullPointerException
NullValueException
BugcheckException
InvalidArgumentException
NotImplementedException
RangeException
IllegalStateException
InvalidAccessException
SignalException
UnhandledException
RuntimeException
NotFoundException
ExistsException
TimeoutException
SystemException
RegularExpressionException
LibraryLoadException
LibraryAlreadyLoadedException
NoThreadAvailableException
PropertyNotSupportedException
PoolOverflowException
NoPermissionException
OutOfMemoryException
DataException
DataFormatException
SyntaxException
CircularReferenceException
PathSyntaxException
IOException
ProtocolException
FileException
FileExistsException
FileNotFoundException
PathNotFoundException
FileReadOnlyException
FileAccessDeniedException
CreateFileException
OpenFileException
WriteFileException
ReadFileException
UnknownURISchemeException
ApplicationException
BadCastException
ManagedClass
BlockRegistry
InputPort
ManagedBuffer
BufferChunk
BufferAccumulator
PortInfo	Information about an IO port
Connectable
Packet
WorkInfo
ThreadPoolArgs
ThreadPool
OutputPort
DType
Label
LabelIteratorRange
SharedBuffer
BufferManagerArgs
BufferManager
Block
Topology
CallRegistry
Callable
CallInterface
RemoteServer
RemoteClient
RemoteHandler
ProxyEnvironment
Proxy
ProxyHandle
ObjectM
NullObject
Object
PluginPath
Plugin
PluginRegistryInfoDump
PluginRegistry
PluginModule
PluginLoader