This is to save battery so that Wifi is not always enabled. You will have to enabled this every time you start GBARunner2. This is to make the dummy MAC addresses appear in the gbarunner2.ini. This is to generate the gbarunner2.ini in _gba folder if you don't have it already.
Run any game and enter the ingame GBARunner2 menu by touching the touch screen.See further down for what combinations of systems work have been found to work and with what builds. Download the latest wifi_link build and transfer to your SD.Grab the latest Wifi_link build from here: (7) 0b8bbe3 This Page is for GBA link-compatible games with GBARunner2 Builds