void cmd_down (void);
void cmd_scdn (char *argbuf);
void cmd_extn (char *argbuf);
-void deallocate_user_data(struct CitContext *con);
-void *CtdlGetUserData(unsigned long requested_sym);
-void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes);
-void CtdlReallocUserData(unsigned long requested_sym, size_t num_bytes);
void do_command_loop(void);
void do_async_loop(void);
void begin_session(struct CitContext *con);