In tip 2669, I described how to make the PDC emulator an authoritative time server
by synchronizing with a reliable SNTP server on the internet.
If you do not want to synchronize with a reliable time source, your PDC emulator can still be authoritative by setting
the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters\Type Value Name to a data value of NoSync:
REGEDIT4
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters]
"Type"="NoSync"