This is just an industrial computer, so it could be running any software.
Is there a hardware dongle (most likely on the parallel port)? If there is, see if there are markings/model numbers on it. And, better yet, take pictures of it and post them.
If there is no hardware dongle, you will most likely have to watch the computer boot up and see if you can catch the name of the software that is running on it. Maybe you can take a video of it booting up and post it as well.