bool configure_io (ChanCount, ChanCount);
bool can_support_io_configuration (const ChanCount& in, ChanCount& out);
void add_send (InternalSend *);
void remove_send (InternalSend *);
bool configure_io (ChanCount, ChanCount);
bool can_support_io_configuration (const ChanCount& in, ChanCount& out);
void add_send (InternalSend *);
void remove_send (InternalSend *);