This 1986 paper reported on various extensions and forms of collaboration for the NoteCards hypertext-based idea structuring system. Written in Interlisp, NoteCards was essentially a single user hypermedia environment at first. https://dl.acm.org/doi/abs/10.1145/637069.637089 https://dl.acm.org/doi/pdf/10.1145/637069.637089 #interlisp #hypertext #retrocomputing