You ordered a computer which could be very useful to you, you thought.
When it finally arrived you discovered that it came with some additional hardware that you have never seen before.
It was a "CT card".
You have never seen such a thing before. Also the guy who sold it didn't know what it was. He was just reselling used stuff. You also tried to find some information online but this was not successfull.
The computer also came with some software included which was apparently "related to the CT card and not only".
Interestingly, the software was made for a different, older computer architecture but there was an emulator already there together with an operating system and all this stuff. That system was also new to you.
You became very curious and wanted to find more about what this is.