Yes you can.
Yes you can. You can also connect DSi to DS and DS Lite to DSi.
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 you can. You can also connect DS lite to DS and DS Lite to DSi.
yes
No you do not.
It must be impossible to do this but you can connect a Nintendo DS or DS lite system to a TV
there is a problem with it
The Nintendo 3DS can connect to the DS from previous platforms but only for games that can be played on the DS or DSi.
Yes it is possible.
in pictochat or download playSimple! Use your DS Download Play!
Yes. The 3DS can play DS multiplayer games with any DS.
Probably can. Try it out.