int  check_url(W3ADocumentInfo *doc, URI *uri);
 long W3AopenView(const W3ADocumentInfo doc,  Widget  area);
 int W3AwriteView(long id, const char *buf, size_t nbytes);
  int  W3AcloseView(long id);
 long W3Asubprocess(W3ADocumentInfo *doc, int method, const
                          char *data, size_t nbytes,  Widget  area);