i have removed the possibility to change the nickname.
i have removed all isadmin and firstadmin settings.
..but users can send messages without nickname and starting with * like
‹yyy.yyyy›

28/08/2008 15:16:35 ‹yyy.yyyy› funzionaaa --> this is a right chat message
28/08/2008 15:17:26 * admin quanto sono pro --> this is a FAKE system message
28/08/2008 15:18:08 * juan xxx.xxxx entra in Principale --> this is a right system message
28/08/2008 15:18:10 * admin piu che pro sono utile... --> this is a FAKE system message
my config:
pfcglobalconfig.class.php:
var $isadmin = false;
index.php:
$params["firstisadmin"] = false;
$params["isadmin"] = false;
thanks
signo