"Hyper-Structured Graphics" --

This was new to me, thanks!

Essentially, hyperlinks for shapes; any graphic element can be linked to another, including other drawings (documents) or sections of a document.

I suppose that's obvious these days. Hyperlinks are expected.

I know that Visio (Windows) and OmniGraffle (MacOS) can do this. I would build active computer network diagrams, dashboards: you could click on a computer's graphic and get an SNMP report.

SNMP: https://en.m.wikipedia.org/wiki/Simple_Network_Management_Pr...

https://www.omnigroup.com/omnigraffle

https://www.microsoft.com/en-us/microsoft-365/visio/flowchar...

I think MacDraw did links, too. HyperCard, sure.