In order to download games to the Nintendo DS, you must go to DS Download Play and download it from another Nintendo DS. Unfortunately, as soon as you exit out of the game you downloaded, you cannot go back to it and it is not saved to your DS so that you can play anytime you like. Sorry this doen't really answer the question but it is very helpful to know this.
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You can download unlimited, full version Nintendo DS and DSi games and easily transfer them to your DS / DSi using: http://www.squidoo.com/Download-DS-Games
You can't download games onto a DS Lite.
No. There is no way to download or play DSiWare games on Nintendo DS or DS Lite systems.
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.
You can download games from other people with a person who has a ds and also from your wii.