yes, it does. it can connect with specified wi-fi points (www.nintendowifi.com has a list), and it can also interact with wii consoles and other DSes.
Every single ds, ds lite, dsi, and dsi XL comes with built in wifi. To get to it, you have to have a wifi compatible game, and there will be wifi settings somehwhere on the game. You have to edit the settings. But i cant help you there. :)
What can detect your DS? Please be more specific. From what I gather, your saying that the Nintendo WiFi USB Connector (WiFi USB) can dtect your DS but not your DS cannot detect 'it'. WiFI USB cannot detect Nintendo DS's unless it is connected to it. So, the Nintendo DS would have to be able to detect the Wifi USB for it to be able to detect the DS. ThE AvEnGeR
You get it automaticly in the DS
Yes
It needs wifi.
Yes. All versions of the Nintendo DS have Wi-Fi.
Indeed-- If you have WiFi with a DSi you can go on the internet.
Yes
that is just wifi
Yes, you need the Nintendo DS WiFi USB adaptor to access the internet.
for ds and ds lite get a game with wifi connection and select the wifi setup, then search for an access point on one of the three slots. You have to have wireless internet to do this, or the Nintendo wifi adapter, which is kinda crappy.
yes it does