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Take Control of Sharing Files in Leopard by Glenn Fleishman

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Appendix A. Sleep and Sharing Files

In order to be reachable, any computer acting as a file server must be turned on and not in sleep mode. Although this seems obvious when stated this plainly, it can cause consternation if you use ordinary machines on your network as servers, as most of us do. Several readers of previous editions of this book wrote in with mysterious problems about servers disappearing, and reappearing later, which we tracked down to sleep options on the Energy Saver preference pane.

In sleep mode on a Mac, the processor cycles down and the monitor switches to a low-power mode. When it's asleep, the computer will respond to a key press or mouse click, but network access doesn't automatically wake the machine.

Note

Macs can be woken ...

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