From trying to read about this years ago, I always remember the "Ent" and the "Enfilade" being Ted Nelson's abstractions for supporting bi-directional linking

From trying to read about this years ago, I always remember the "Ent" and the "Enfilade" being Ted Nelson's abstractions for supporting bi-directional linking https://en.wikipedia.org/wiki/Enfilade_(Xanadu) https://en.wikipedia.org/wiki/Enfilade_(Xanadu)