MacBook Pro wireless"Wake For Network Access"

Does anyone know how "wake for network access" is supposed to work on a MacBook Pro? According to several Apple information pages it is theoretically possible to wake the laptop wirelessly if your router is an Airport. However, when the laptop is asleep, it loses it's connection to the network so how can this be possible?

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More info:

Here's a seemingly contradictory piece of info from the Apple page for "About Energy Saver sleep and idle modes in Mac OS X":

"Note: Portable computers have no network connectivity when in sleep mode, but can wake if the Energy Saver option "Wake for network access" is enabled. If you wish to use file sharing or don't want to interrupt your Internet connection, you should not manually put the computer to sleep, and you should drag the "Computer sleep" slider to Never."

So portables have no network connection when asleep, but can wake if "wake for network access" is enabled. How? If that is actually possible then why does it also say you should not ever put it to sleep and should set sleep to "never"?

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As there are more answers in the other post,

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