If you mean a WEP or WPA key, that is to connect wirelessly for an internet connection. You'll need to enter the key, which you should have if the router or access point is yours.
The WEP key is the encryption key your wireless router uses to stop unauthorised people accessing the network. When you set yours up, you'll have set the key so your computer or laptop can access your network. All you need to do is use that same key on the DSi to access the network.
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No one 'needs' a dsi
Flipnote access you need flipnotes from japan to have a dsi with complete japan access you need a Japanese dsi.
Why wont my lefr arrow key work on my dsi
No, a DSi won't recognise it. You need an AR DSi.
The DSi connects to your wi-fi network in the same way as your PC does. When you scan for networks on the DSi, your network's SSID should appear on the list, then all you need to do is enter the same WEP/WPA key your PC uses.
The WEP key is the encryption code needed to access a wireless router.
WPA or WEP
Yes, but the DSi comes with one.
you just can't
you go to dsi shop and go to free and download Nintendo dsi browser you need to download the browser from the dsi shop