Again, all of this comes from Ted Nelson. He also had philosophical antecedents, but in terms of software it was his dream of Xanadu that was the first hypertext system.
However, it’s worth pointing out that every attempt at Xanadu (under the name Xanadu) thus far has also turned out to be a fractional implementation of Nelson’s dream.
Turbo Pascal help was using hypertext. Many people were exposed to it by the 80s
Again, all of this comes from Ted Nelson. He also had philosophical antecedents, but in terms of software it was his dream of Xanadu that was the first hypertext system.
However, it’s worth pointing out that every attempt at Xanadu (under the name Xanadu) thus far has also turned out to be a fractional implementation of Nelson’s dream.