The wi-fi supports WEP and WPA encryption but any DS game that is not 'dsi-enhanced' can only go online on a WEP connection even though the 3DS can connect using WPA.
You can delete the internet connection settings in the Nintendo 3DS System Settings.
You can use Online in all Nintendo ds titles on the 3DS. you will need to change setting for the DS internet in options on the 3DS menu, because 3DS internet connection settings is different to DS Connection settings.
When your 3DS is connected to the internet, launch system settings, then under 'other settings' find 'System update' on the 4th page.
Nintendo 3DS games are only playable on Nintendo 3DS systems, and in order to play Nintendo 3DS games multiplayer, you require multiple Nintendo 3DS systems. However, Nintendo DS and DSiWare games that support multiplayer can be played using the Nintendo 3DS system.
It can support video. You can find video on the 3DS on each of these places: Nintendo eShop, Nintendo Video, and Netflix (as of Aug 25, 2012).
Currently there are no Nintendo Systems that Support Skype!
If your 3DS is updated then go to system settings, click other settings, then scroll through the pages until you see the "system transfer" button then chose Nintendo 3DS to Nintendo 3DS. However that doesn't copy it. Also extra data is deleted for that game. Also you will need to download it again.
Nintendo 3DS only support a single personal profile. There is no such thing as a 'family account'.
It has a settings option where you can search for a access point and connect to it. But if it is locked,you need to have a security key. Just make sure there is wifi at your home and that you can connect to.
The Nintendo 3DS has Parental Controls that limit the use of online features and changes to the system settings. There is, however, no password that prevents the complete usage of the Nintendo 3DS
Yes, the Nintendo 3DS LL is the Japanese name for the Nintendo 3DS XL
The Nintendo 3DS is created by Nintendo from Japan, hence the name 'Nintendo' 3DS