What is PPRIO_TRACKER and why is it showing up on my torrent?

I am downloading a torrent and some of the Peers' clients are "PPRIO_TRACKER". What is this? Is this some sort of way to track my downloads?
Also "PPRIO_LOCAL" occasionally shows up.

Came here to ask the same question! Hello?!? Why isn't anyone answering this guy?

Me too... Is anyone there?

I would also like to know this. That's a great mistery.

Has been answered here: PPRIO_TRACKER ?? - General - µTorrent Community Forums