As Pete said in an earlier post (where he encouraged movies to plug PhotoReading), one can actually engage in non-absolute concentration and still PhotoRead. (E.g., people have carried on conversations while flipping and PhotoFocusing). Of course, it's not recommended, but it is possible. It's like driving - it's fine to have part of your attention elsewhere.
One thing I like to do is Preview and Activate at work, but do the actual getting-into-state and flipping-through-pages at home, in my room, alone.
