No, you only need the connection to actually do the download. Once downloaded, the games can be played while offline.
Yes, you can play DS lite games on the DSi as well as the DSi XL
No. 3DS games are not compatible with the DSi XL.
no the browser on dsi is worthless unless you are looking at pictures on the internet but games or videos forget about playing internet games on dsi
No
Yes, the DSi cnstill dowireles conction with the DS. My friend has a DSi and I am saving up for one. You can still use Pictochat and play with friendson games like Pokemon D/P and Patinum. I do not know about DS download or neither if it can do wireless with a dsi XL. SORRY,
The DSiware games are downloaded to your DSi and appear on its menu. You do not need to be connected to the internet to play those games.
It has to be downloaded directly from the DSi over a WiFi connection.
Yes, the DSi can connect to the DSi store, from which games can be bought and downloaded.
No, there are no refunds on the DSi store.
Yes
One of the first 'DSi-enhanced' games was Pokemon Black and White, which could do things like use the DSi's advanced connection settings, letting it play over a WPA connection.
no you can't play dsi games in ds but you can play ds games in dsi.
yes
The DSi can play DS and DSi games, as well as DSi ware games. It cannot play GameBoy games or 3DS games.
Yes, you can play DS lite games on the DSi as well as the DSi XL
Sorry no no$gba cannot enable WiFi cuz its downloaded on the comp and not on an actual Nintendo DS (Original, Lite, DSi) console.
Yes, they can play the dsi games.