Any idea on how 802.11n software updater work?

Hi,
I have PB-G4 and just read on macworld that apple has released a 802.11n software updater. This enables 802.11n wireless network on your macbook pro or imacs, basically hardware with intel dual core. Does anyone knows if I how this upgrade works? Can I use this updater on PB-G4?
Best regards,
Brilty

This updater works by adding computer code to the machine which enables the use of 802.11n functions that are already present in the hardware. It cannot be used on your PowerBook or with any Mac that doesn't have the hardware components needed to use 802.11n on the built-in card.
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Any idea on how 802.11n software updater work?

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