void list_all_messages (CT *, int, int, int, int);
int list_switch (CT, int, int, int, int);
int list_content (CT, int, int, int, int);
/*
void list_all_messages (CT *, int, int, int, int);
int list_switch (CT, int, int, int, int);
int list_content (CT, int, int, int, int);
/*