deferred class IO_MEDIUM Ancestors DISPOSABLE* STRING_HANDLER Descendants FILE* SOCKET STREAM Clients IO_MEDIUM* KL_INPUT_STREAM_ROUTINES KL_OUTPUT_STREAM_ROUTINES MEDIUM_POLLER POLL_COMMAND* POLL_MASK SED_MEDIUM_READER_WRITER SED_MEDIUM_READER_WRITER_1 STORABLE WEL_DIB Suppliers BOOLEAN INTEGER_32 IO_MEDIUM* MANAGED_POINTER