Yes, you can. When you connect to the internet with the Nintendo 3DS, open the Nintendo eShop application. Under the category of 'Demos', you can download demos for free.
If you are referring to game demos then go to the e shop, scroll right until you find the button saying "game demos" or whatever.
-_- you cant
Right now, you cant. Nintendo has not given out demos to be played on the Wii. Maybe in the future they will be available.
get a playstaion network and look on demos for p23 and download it
you cant
You can play in 3D on a 3ds and a Dsi cant.
It has dsware (dsi games), but you cant buy wii games for the 3ds
No. A DSI cant use a 3DS charger.
u cant
It doesn't really matter. The only difference between the two demos are different playable characters and different enemies. Other than that, the two demos are basically the same.
you cant use the 3DS charger for the DS/DS Lite, but you can use the 3DS charger for the DSi and the same with the DSi charger, you can use it for the 3DS.