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[linus_of_hate]

if you go here x2 .. that will tell you just about everything you need
to know about programing something for the ds ..

http://www.double.co.nz/nintendo_ds/nds_develop1.html
http://www.aaronrogers.com/nintendods/index.php

in the time you've spent doing all this you could of prolly had
theapp you wanted made already...