If you attempt to make sense of Engelbart’s design by drawing correspondences to our present-day systems, you will miss the point, because our present-day systems do not embody Engelbart’s intent. Engelbart hated our present-day systems. If you truly want to understand NLS, you have to forget today. Forget everything you think you know about computers. Forget that you think you know what a computer is. Go back to 1962. And then read his intent. The least important question you can ask about Engelbart is, “What did he build?” By asking that question, you put yourself in a position to admire him, to stand in awe of his achievements, to worship him as a hero. But worship isn’t useful to anyone. Not you, not him. The most important question you can ask about Engelbart is, “What world was he trying to create?” By asking that question, you put yourself in a position to create that world yourself.
http://worrydream.com/Engelbart/