int W3AopenDoc(const char *url, int method, int flags,
    const char *referer);
 int W3AreadDoc(int fd, char *buf, size_t nbytes);
 int W3AwriteDoc(int fd, const char *buf, size_t nbytes);
  int  W3AcloseDoc(int fd);
  int  W3AinfoDoc(int fd, W3ADocumentInfo *info);
  int  W3AdeleteDoc(const char *url, const char *referer);