popup on mouse hover?

I do not have much of a dev skillset. The best I can do is write rudimentary shell scripts.

I want MUSHclient to highlight a word in the buffer and make it look like a link where on mouse hover, a popup of specific notes come up for display.

Is this possible?

There is provision there for:

* A hint (what appears if the mouse hovers over the hyperlink).

So what you could do is detect the appropriate line in a trigger, omit it, and call a script to replace it with a similar line, with the parts you want replaced with hyperlinks.