Help with Wake Up on Lan

I have not been able to find clear cut instructions for waking up my Vista computer through the network card. I have a Vista Ultmiate x64 desktop that I allow to go to sleep. It is hard wired into a Netgear wireless router. I would like to be able to use my laptop (with a wireless card) to wake-up the desktop so I can use files off of it. I am not thinking through internet at this time. Just through my local network. My desktop is upstairs and I use the laptop downstairs. I have seen things on Magic Packet and etc. but I am unsure of how to set everything up or what I need. Thanks.