_CP_delete_item is equivalent to the delete expression,string BASIC statement.
int _CP_delete_item(int expression, CPSTR* string)
The expression should be an integer file descriptor returned by the _CP_open call. This function returns -1 if an error occurs. The error code is contained in _CP_errno.
/* Deletes item "1" from "myfile". */
CPSTR * s = _CP_mkstr("myfile");
CPSTR * t = _CP_mkstr("1");
int f;
_CP_open(&f,_CP_str_null,s);
_CP_delete_item(f,t);