Earlier quoted context omitted.
The contemporary windowing system NeWS is worth a look: https://en.wikipedia.org/wiki/NeWS Its architecture was more similar to modern web apps, with the UI running code and processing events on the client machine.
I remember it. It was far prettier than motif at that time. And Framemaker was so pleasant to use compared to Word. Both NeWS and NeXT were using Display Postscript ( https://en.wikipedia.org/wiki/Display_PostScript ). Do you know if NeWS was an inspiration for NeXT ?
In NeWS you could write your client applications completely in PostScript (or something compiled down to PostScript) and it had its own object-oriented, multi-threaded environment with event handling etc.
NeWS was more of a predecessor for Java than NeXT.