Thank you so much
With your info and websites (and windows help) I've been able to
prepare an OU, put all the users i wanted in, then with right
click-->properties I've been able to set a new policy (change explorer
title bar) for this new ou.
I thought that using ou would help me to spred this policy around my
clients (just one, lol) but I had no luck :|
In the ou i've tried putting the only domain user I have and/or its
computer...
No way to see that title bar changing

Any hint to understand where I'm wrong?
Forgive me for bothering about such stupid issues...
It's time to buy a book :|