1. First you need to download the latest version of DS2Key (I use v1.01) which can be found here: DS2Key Forums
2. Extract and run DS2Key.exe, making note of the port number at the bottom of the window (the default is 9501, you can change this if you wish). Make sure it is set to profile 0 also. You need to keep this program open and running, don’t close it.
3. Now, copy the DS2Key.nds file onto your cartridge and run it from your DS. The program will automatically start to try connecting to your wireless access point. It uses the Wi-Fi configuration details already set on the DS (you will need a wireless game such as Mario Kart DS to configure these settings).
4. Once connected, click on the little blue cog (in the top left corner) to open the settings screen. You will need to enter the IP address of your computer in here. For this to work, you will need to make sure that you have static IP addressing configured on your PC and router, you can find more information to do this, here and here.
5. Make sure the port number is the same as in the PC program that you made a note of earlier. Set the profile to ’0′ also.
6. If all of your settings are correct, you should now be able to send button presses to your PC. Use the log at the bottom of the screen to help to test this (set the Log Level to ‘All Messages’). You can use the program to configure what cosponsoring button does what.

And that’s all there is to it. You may need to make some additional configurations to ensure that you can connect and that everything is allowed in your firewall and router, use PortFoward to help with this.

Now all you need is a copy of Super Mario Bros. X and you’ll be well away!

Here is a video demonstration of it in action:

If you have any problems setting it up or want to ask a question, drop it in a comment.

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