This is a tool that will allow you to control the power management settings of your client machines using Group Policy, it will also work on workgroup machine using reg entrys. This might be a bit esoteric, but it took me a long time to find something that works reliably. Unfortunately Microsoft did not include any Templates for this, probably because GPO cannot handle binary registry entry's. Here is the link for it,
http://www.terranovum.com/projects/e...ar/ez_gpo.html