I have one more question to ask you.
Is there any way that a system can records users that
connected to TS server onto the log file?
thanks again for your help.
If you enable auditing of security events, you will see all logon and
logoff events in the Security tab of the EventLog on the TS.
You can filter and export these events once a month to a tab-
delimited textfile for further processing.
Or you could make your own, very simple logon report by adding a line
to your TS-specific login script:
echo %username% %clientname% %date% %time% >> logon.log
195461 - How to Set Up a Logon Script Only for Terminal Server Users
http://support.microsoft.com/?kbid=195461