Questa me la segno... soprattutto penso sia un ottimo
modo per lockare da remoto un server 
.
Many administrators have missed that there is a "hidden" third connection that can be made to Windows Server 2003 servers.
[...]
It's pretty easy, and I actually modify my RDP shortcuts to always connect
to the console session so that I never conflict with anyone. Here's how
it works:
MSTSC /v:<name or IP of the server> /console
This basically uses session 0 or the console session. So, if someone is standing in fron of the monitor connected to the server, it will say locked as you work away (much like Remote Desktop in Windows XP).