anchor.diff:  del_alt_ns(IP, Port) ->
       call({listop, alt_nameservers, del, {IP,Port}}).
   
  -del_alt_ns() -> 
  -    call({listdel, alt_nameservers}).
  -
   %% add this domain to the search list
   add_search(Domain) when is_list(Domain) -> 
       call({listop, search, add, Domain}).
  
positive.code: 		    {reply,error,State}
  	    end;
  
  	{listdel, Opt} ->
   	    ets:insert(Db, {res_optname(Opt), []}),
   	    {reply, ok, State};
  
  	{set_hostname, Name} ->
  	    case inet_parse:visible_string(Name) of
  
negative.code: 	    ets:delete(Cache, cache_key(RR)),
  	    {reply, ok, State};
  
  	{listop, Opt, Op, E} ->
  	    El = [E],
  	    case res_check_option(Opt, El) of
  