I do not see this when running bpgetconfig without parameters on the master server.
However, if I run this on my PC I do see it - I can also tie it down with what it is referring to:
- it's the list of clients that are in your "Client List" within the Backup, Archive and Restore GUI, even down to the order in which they appear in said list.
Do you find above the list of "Clients =" entries a "Browser =" entry? That's the client that the BAR GUI will first open on (or last opened on, depending on how you look at it!)
I don't run restores directly from our master but do from my PC which is why there's the difference for us. So, if you indeed do use the BAR GUI for restores on your Master server, then that is what this list is, it's nothing "important" as you could always "rebuild" it anyway.