Identix BioLogon 2.03 and earlier does not lock secondary displays on a multi-monitor system running Windows 98 or ME, which allows an attacker with physical access to the system to bypass authentication through a secondary display.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6948
http://www.securityfocus.com/bid/3140
http://ntbugtraq.ntadvice.com/default.asp?pid=36&sid=1&A2=ind0108&L=ntbugtraq&F=P&S=&P=724
http://ntbugtraq.ntadvice.com/default.asp?pid=36&sid=1&A2=IND0108&L=NTBUGTRAQ&F=P&S=&P=71