D-Link IEEE802.1x supplicant Program The Supp1x Program supports the functionality of IEEE802.1x supplicant. Supp1x allow you to authenticate with IEEE802.1x-ready ethernet switch. The authentication type supported right now is MD5-Challenge. Supp1x can run on Windows 98, Windows 98SE, Windows ME, Windows 2000, and Windows XP. To install Supp1x, run the Setup.exe program. NOTE: The supplicant function is build in by Windows XP, if you want to use Supp1x in Windows XP, please turn off the supplicant function of your Windows XP.