#define H_VERSION "ZIP1"


extern char *hb1;
extern char *hb2;
extern char *hb3;
extern char *hb4;
extern char *hb5;
extern char *hb6;
extern char *hb7;
extern char *hb8;


boolean history_exists(void);
FILE *open_history(char *history_date);
FILE *create_history(char *history_date);
boolean is_in_history(FILE *hfile, char *messageID);