The supported 802.1X supplicants (clients) are Windows 7 and Windows 8 native clients, and Meetinghouse AEGIS.
A Windows 7 or Windows 8 802.1X supplicant can be authenticated as a computer or as a user. Computer authentication requires a certificate installed in the computer certificate store, and user authentication requires a certificate installed in the individual user's certificate store.
By default, the Windows 7 or Windows 8 machine performs computer authentication as soon as the computer is powered on, or at link-up when no user is logged into the machine. User authentication is performed at link-up when the user is logged in.
Windows 7 or Windows 8 also supports guest authentication, but this is disabled by default. Refer to relevant Microsoft documentation for further information. You can configure a Windows 7 or Windows 8 machine to perform computer authentication at link-up even if a user is logged in.