I have seen in other posts that it can be tracked. Is this still possible?

It can't be tracked. However, you can send the serial number to Rob in case he gets a support call or a return-for-repair. There are other reasons they like to have the serial numbers of stolen players, but they don't involve tracking.

Anyway, old versions of the Emplode software used to prompt for the serial number at installation time and store it in the registry. I don't know which registry key it would have been in.