Forget about the lowtech retinal scanner that unlocked Arnold and Tom's secret headquarters in "True Lies." Kids' stuff. Two scientists at Los Alamos National Laboratory have come up with a way to identify people by patterns in the colored part of the eve, the iris. They say these permanent designs differ from individual to individual. The new device collects about 2,000 times as much information as a scan of the retina, a structure on the back of the eve, so it's harder to fool. And users don't have to stare into a visor for their eyes to register they just peer into a screen.