I was talking with the guy who wrote it yesterday. It's a PERL script that runs on a UNIX box. He said it was a bit tricky getting the password value twiddled into the format Microsoft would accept for an AD password, but it boiled down to including the right PERL libraries and about four lines of code.
This is topical for us right now because as we move to Infor 10, managed services says they can't provide us the same password reset scripts as were provided to us for version 9 because the Infor user accounts (needed for LID access, IPD, etc) are now Infor AD accounts rather than local server accounts, and they don't have script that can change passwords in their AD. I could go on, but I won't.