Waking Mac from Sleep over the network

All, I tried to find other post on this but was unable too, so I am sorry if this has been answered already. I have an iMac G5 w/iSight camera built in, an ibook and a Mac Mini. I am trying to keep all my music, photos and videos on my imac and then share them over my local network through itues and iphoto sharing. Which works just great. But, if my iMac goes to sleep there is no way for it to be awaken over the network, at least that I can find. Is this a true statement? If I would like this data to always be available do I need to disable sleeping, or just put the monitor and HD to sleep, but not the entire computer.
Any suggestion/information on this would be greatly appreciated.
Regards, Tom

Hello,
Here are some good articles for you to read. I think you'll know what to do when you're done with these:
https://webserver.brandeis.edu/pages/view/Bio/MacOSXWakeOnLAN
http://en.wikipedia.org/wiki/Wake-on-LAN
http://www.macosxhints.com/article.php?story=20050118192723153
Hope this helps.

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