how to synchronize external time server with window server 2008

1)select your time server from http://support.microsoft.com/kb/262680
2)after selecting your time server open command prompt
3)write command:
 w32tm /config /syncfromflags:manual /manualpeerlist:"<ip addresses>" /update /reliable:yes
4)here ip address is of your time server name

if you want to stop the synchronization time with time server writer a command
net stop w32time

for starting a synchronization with time server,write a command
net start w32time

for showing, which server hold PDC emulator task
dsquery server -hasfsmo pdc