Shutdown PCs when inactive but only overnight

From: KD (keegan.drage_at_pamglobalfunds.com)
Date: 04/30/03 

Date: Wed, 30 Apr 2003 02:06:18 -0700

I have to setup our environment so that PCs are shutdown
after a period of inactivity overnight, say that after 7PM
and before 7AM if the PC is inactive for 1 hour.