DSI? Yes.
DS? actually you can if you have high speed internet and and a wireless router.
All DS' can access the Internet provided the encryption is WEP.
Yes, you need the Nintendo DS WiFi USB adaptor to access the internet.
On the newest DS systems, you can access the Nintendo eShop, which allows you to buy and download games if you have an internet connection.
I don't think you can, unless you have a DSi, which can give Internet Access, I'm pretty sure.
You should be able to. All you need is to register your home WiFi/internet connection into your DS.
Only certain games like Animal Crossing allow your DS to connect with wifi to a computer that has internet access and play in other gamer's towns online, and let other gamers play in your town. DS does not have internet surfing ability.
The Nintendo DS comes equipped with built-in wi-fi, so it can be used with the Internet via any unencrypted wi-fi access point. Nintendo actually sold an Internet browser cartridge for a short time for the DS which can be found used at many retailer chains like Gamestop.
You will need internet access and either a wireless router or something like a USB Wi-Fi Connector. After you have set these up, you can access internet options on your DS/DSi (Also, games using wi-fi will have a button to set it up somewhere in the game's main menu.) Following the instructions to set up wireless shouldn't be hard to follow, just make sure you enter a password and allow the Nintendo DS to access the internet (if you're using a router). The DS, DS Lite and Regular DS Games won't support WPA encryption, so if you want to add a password, make it WEP.
It depends if the Internet is registered on you DS lite. Like if it approves it.DS and Wii ExpertNadine
If your router is protected by WEP encryption, then yes, you need to know the WEP key to allow the DS to access it.
A DS can only use WEP decryption. It could be that your router's security is set to WPA security, which the DS cannot access.
The DS uses Wi-Fi connection to connect to other DS's and access points. The connection is pretty much the same to connect to the internet and to other devices.