In this example, I show how to add a scheduled job (taken from the article Shutting down an idle Windows computer) to multiple domain clients, using GPOs.

First, create a batch file (for example in %SystemRoot%\SYSVOL\domainname\scripts) with the following content:

schtasks /Create /RU System /TN "Shut down idle system" /SC ONIDLE /TR "C:\Windows\system32\shutdown.exe /s /f /t 0" /I 20

Open up the Group Policy Management console and add a new GPO. Go to Computer Configuration > Windows Settings > Scripts > Startup and add the newly created batch file. Now you just have to link the GPO to an OU which should be affected.

Windows XP Professional Product Documentation – Schtasks:
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/schtasks.mspx?mfr=true