I apologize for my absence. Since my last post, I moved into a new house, helped family with an overseas move, and was otherwise procrastinating. I started writing this post back when I was doing a playthrough for TAG, and almost from the start, I had to wrestle with the question of emulation. After all, it's a DOS game from 1993. I don't have a souped-up 386 sitting around, so I had to find other ways to run the program.
Emulation isn't just about MS-DOS, but it's a starting point for this discussion.
Modern incarnations of Windows choke at the thought of running a DOS program. So, over time, people have come up with ways to run the new programs, the ones the hardware merchants and operating system folks wish you would just forget about, so that they can sell you new replacements at a new higher profit.