Private BitTorrent trackers require that you keep a certain upload/download ratio. This basically means that if you download, and don't leave your client running for seeding for as much as you downloaded, you will probobly get kicked out of the site sooner or later.
RatioMaster is an open source project that emulates your favourite client and sends the tracker with false info, saying that you are uploading. What a great solution for people with low upload rate.
A guy that calls himself NRPG, created his own version of RatioMaster, which added a lot of features to the original RatioMaster. His version looks out for your opened client, and takes all the random-generated values from it, that way making the tracker very hard to spot the cheat.
So far so good, as this was only the exposition to the situation.