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Take Control of Screen Sharing in Snow Leopard by Glenn Fleishman

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Solving Sleep

It used to be that a sleeping Mac would slumber through any attempts to stir it from afar. These days, there are two discrete ways to wake a remote Mac. Wake on Demand is new to Snow Leopard, and works only in particular cases; an older method—Wake on LAN—works with previous systems, but requires that a sleeping computer be connected via Ethernet.

You can also simply Disable Sleep mode to make sure a Mac never nods off.

Enable Wake on Demand in Snow Leopard

In Snow Leopard, Apple added an extremely cool feature that lets you simultaneously benefit from the reduced wear, electrical cost, and heat of having your computer sleep when not in use, while retaining continuous access to services, such as screen sharing, available from that computer. ...

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