Shutdown the network

Hi guys,

Basically, I run a network of about 100 XP clients and a number of Win2003 servers. What I need to do is to be able to automatically shut down all the clients at a specified time. I'm sure this can quite easily be done in vbs, but my programming skills are not fantastic, and I'm learning as I go along.

Any suggestions?

I would really appreciate any advice,

Thanks,

Si