printing into notebook

Printing directly into a notebook could be solved by a handheld scanner (not flatbed) like device. The key idea is the laser computer-vision-powered location technology that powers modern optical mice. Use the camera to determine where you are on the page and determine whether to drop ink, tonor, high-powered laser to burn the page, at that location. The printer need not be as wide as the page; once can go up and down "painting" strips of the page one wants to print. Come to think of it, handheld scanners can be improved by the laser location idea as well.