Can I wake my Mac from sleep with network activity?

Just got a MBP and now am enjoying mounting it on my iMac and vice versa via my home network (using URL address with AFP://xxx.xxx.xxx.local). Question: Is there a way to wake either one from sleep when I access it from the other?
TIA,
Picman

Elamc,
OK, I now know. Some Macs will support both Ethernet and wireless and some won't. The setting in my MBP says "Wake for network access", while my iMac says "Wake for network Ethernet access". The MBP supports both, but the iMac just with a cable connection. I did find a good tech note that describes the how's and what's. Just Google "Mac wake on network access" and look at "Mac OS X v10.6: About Wake on Demand".
Thanks for your info ... it helped.
Picman

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