http://www.itworld.com/Man/2687/040603mspatent/ http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=6,727,830.WKU.&OS=PN/6,727,830&RS=PN/6,727,830