Classes:
BASIC_IO
CALLBACKABLE
DIRECTORY
DIRECTORY_INPUT_STREAM
DYNAMIC_SYSTEM_LIBRARY
ENVIRONMENT
EXCEPTION
EXTERNAL_PROCESS
FILE_SYSTEM
FILE_SYSTEM_CONSTANTS
FILE_SYSTEM_ENTRY
FSYS_DAT
MATH
PERSISTENCY
PERSISTENT_ARRAY
PUT_COMP
RECURSIVE_DIRECTORY_INPUT_STREAM
RTS_ATTACHED_MARSHALER
RTS_ATTACHED_MEMORY
RTS_ATTACHED_UNMARSHALER
RTS_MARSHALER
RTS_UNMARSHALER
SORTED_ARRAY
TEXTFILE