This paper describes Virtual Notes, small yellow stickers which can be freely placed on instrumented HTML-pages using standard Internet technology. In a teaching and research environment they provide a user- friendly and flexible way of improving collaboration by annotations, feedback, post-its and blackboards.
Geyer-Schulz, Andreas; Koch, Stefan; and Schneider, Georg, "Virtual Notes:Annotations on the WWW for Learning Environments" (1999). AMCIS 1999 Proceedings. 46.