S_DUPFIRST
#define S_DELETE (S_WRITE | S_DUPFIRST | S_DELNO | S_EXACT | S_STACK)
#define S_FIND (S_READ | S_DUPFIRST | S_DELNO)
#define S_FIND_WR (S_WRITE | S_DUPFIRST | S_DELNO)
#define S_KEYFIRST (S_WRITE | S_DUPFIRST | S_PAST_EOF | S_STACK)