leblanc49,
the software that will work for the C&H D100 plc can be found on the page that Eric posted it is: PDD2040-V2 Also on that page is all the information you need for the D100. If you can't find it do a search for "D100" on that page and you will find several occurances of it. A search of "EX-series" took me right to the manuals. I am not in the habit of giving away software that has been rightfully paid for. As for the hardware key, I do not know anything about the internals of it. You maybe able to get one, or the mechanics of it, from Toshiba as their software also works for the D100.
Cheers.
Steve