Anyway, in another forum someone kindly told me that AJAX is the solution.
I didn´t know about AJAX, because I was initially too focused on using JSF.
After done some investigation on-line, now i see that Ajax is going my way, and that a can even develop hypbrid AJAX - APPLET applications.
After reading many forums, it seems that the "ZK open source Ajax framework." is the best around this days.
What do you folks think ?