Yes, it is fully compatable.
For the most part, yes you can. If you want to connect with pictochat or DS games (including DS Download), you can connect between a Nintendo DS and DSi. However, for DSi specific games, such as DSi games and certain applications, the Nintendo DS will not be able to connect. But, note that certain DSiWare games that can DS download play still can be connected to the Nintendo DS.
Yes.
yes
Yes. Because i have both.
It must be impossible to do this but you can connect a Nintendo DS or DS lite system to a TV
Yes, since both the Nintendo DS and DSi has the Pictochat application, you can connect these two systems together.However, the Nintendo 3DS does not have pictochat, so the 3DS will not be able to connect
Yes it is possible.
The Nintendo 3DS can connect to the DS from previous platforms but only for games that can be played on the DS or DSi.
There are several types of Nintendo DS systems ranging from the Nintendo DS, Nintendo DS Lite, Nintendo DSi, and Nintendo DSi XL. The newest version of the Nintendo DS is the Nintendo 3DS and Nintendo 3DS XL.
The Nintendo Ds is able to connect with other nearby Nintendo Ds's wirelessly with its built in technology. Although for accessing online there is an adapter available for DS and DS lite models.
The Nintendo Wii/DS wireless adaptor is a USB plugin that plugs into your PC. This turns your own PC into a wireless hotspot that the DS or the Wii can connect to, so if your computer uses a wired connection, you can connect them wirelessly. It can also be used if your own router uses WPA encryption - the DS can only connect using WEP, and can use the adaptor to connect instead. Note that while the DSi can use WPA encryption, this is only for the DSi store or browser, not games, so it can be useful to DSi users too.
It was just called Nintendo DS. Then Nintendo DS Lite, Nintendo DSi, Nintendo DSi XL.