[maemo-developers] purpose of the interface wlan0:1

[From: Michal Šebeň]

helo :)

may be my question is not so useful but i want know this :
when I run on my n770 ifconfig I see three interfaces lo, wlan0 and wlan0:1
(wlan0:1 with ip 169.254.68.234)
what is the purpose of the interface wlan0:1 ?
i could't find definition of this interfaces in /etc/network/interfaces, why
?

thanks
miso
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