Oh, I use keytweak and store them in the registry. I have one on my windows box, one on my linux workstation.
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And I have a LOT more remaps than the average person, as you can see in the attached image. Those are IBM 1397000 models, which are the equivalent of Unicomps 3270 layout emulator with ps/2.
Then for the extra keys (F13-F24), you can use AHK or Sharpkeys, or whatever to map them to macros. But Windows recognizes them as being pressed, and as being unique.
And the Emulator model sends unique scan codes, that's the difference. And I'm pretty sure that's the difference in the models, as I believe they all have the same controllers. Though that's just from things Chuck and Jim have mentioned at different times when I've called.