Hi Alessio,

At a Windows NT 4.0 network, you can use the statement NET TIME /SET at the boot of each client machine, that will update client hour machine by the hour that's on the PDC (Primary Domain) --- that's the Server.
That's a good choice if you want everyone to have the same time on their machines.
The other questions, sorry i can't help.

Good luck.

Arrivederci,

Ricardo