With Mac OS X you can share your music, printers, files, and even your screen with other computers on your network.  Previously, in order for items shared by your Mac to always be available, you had to configure your Mac to never go to sleep.  With the new Wake on Demand feature in Mac OS X v10.6 Snow Leopard and an AirPort Base Station or Time Capsule, you can see and access shared items even if that Mac is asleep.  This helps you save energy and reduce costs while still ensuring full access to all your shared files and devices, even remotely across the Internet. Note: This service requires an Apple AirPort Base Station or Time Capsule with firmware 7.4.2 or later installed, or an Apple TV with software version 3.0 or later. To use Wake on Demand wirelessly with a WPA or WPA2 network, the AirPort base station or Time Capsule must be hosting the network.

Continue reading here:
Mac OS X v10.6: About Wake on Demand

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