They don't mean much in a classroom of say 30 or 40. A lecturer will have n people with n texts and will have to synchronise them. In a typical lesson you jum

They don't mean much in a classroom of say 30 or 40. A lecturer will have n people with n texts and will have to synchronise them. In a typical lesson you jump to different pages also non-sequentially. The best option is a PDF etc. that you can optionally print. Anything else is a recipe for chaos, especially if you're not in a CS classroom.