I once rented a workshop that had previously been the home of a small jewelry making shop. Before moving my gear in, I vacuumed and mopped every surface and ran everything through a makeshift sluice box.
Recovered nearly 2oz of (powder) gold and several dozen gemstones.
Of course I immediately cleaned out the air ducts, all the way to the plenum, and dug up the ground near the entry - recovering another oz or so that I suspect was simply tracked out by the previous tenant on his shoes over the years.
I wonder if these guys have found a similar angle. Gold tends to accumulate in the lowest cracks.
I seem to remember using one called AGT (adventure game toolkit) that I'd obtained from some sort of mail away floppy shareware service or something. It's wild to think of how much has changed in the last few decades!
I've used a very similar library (valtio) to achieve this in a number of fairly large projects over the last few years. I believe both state management libraries are written by the same guy, actually
I am very sad to hear this. Greg was my mentor during my first internship at the Arctic Region Supercomputing Center in Fairbanks Alaska back in the very early 2000s.