I came across this in my cyber-travels, which tells us something of what Apple thought was going to be huge back in the early 90s. It is a magazine advert selling the then-new Claris Resolve, recently brought into the Claris fold from a separate company and given an overhaul. The paragraph of interest reads:

Yet perhaps the most shining quality of Claris Resolve is how it exploits System 7's most powerful functionalities — Publish & Subscribe and InterApplication Communication. So you can effortlessly combine the power of Claris Resolve with other applications.

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Resolve really was a nice product — which is here said to be overshadowed by something newly introduced in System 7.

Now, here we are, the zealots. Did any of even us really use these "most powerful functionalities" back in those days? And if not, why not?