The difference between the PSP and DS wireless systems is that the PSP implements all 7 layers of TCP/IP in both frimware and hardware, giving the game developers the neccessary instructions in the official SDK to use it. The DS implements only a few (1 and 2, I believe) on the hardware, with the rest having to be written into a DS game itself.
Speaking strictly from a networking perspective, the DS wireless solution is stupid, idiotic and just goes to prove that Nintendo STILL doesn't understand "online gameplay" while both Sony and Microsoft do.
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