Caché Installation Unique Identifier

Hello community!

Is there any method/property/way in Caché to obtain something like unique identifier for installed Caché system? The idea is to get the identifier that will differ on any other installation/machine/etc, but will forever remain the same for the current installation, even if $zv changes (in case of update) or any data is removed from the database.

In other words, I need something close to GUID (no matter which format or type it has), which persists in Caché installation and has no chances to change in future, whatever changes user may perform: changing machine or OS user name, updating Caché, etc.

Is this possible? If not, why such identifier can't exists? How to get machine's MAC address, if there are no other solutions?

Thank you for any help and suggestions!