the e3 "lightgun" games used a cursor, afaik, and it's uncertain whether simple user calibration would make the waggle wand an adequate lightgun. traditional lightguns use calibration screens, but mainly they're lightguns -- they read white flashes on crt tvs so they know where you're pointing. the calibration is supplemental. there are lightguns on the market using technology similar to the waggle wand's pointer, but afaik they use multiple sensor bars. my feeling is that you'd get a lot of "drift" with user calibration alone, and would constantly have to recalibrate. we'll see, i guess.