Mostly by rumor mongering.
Sunray and others gathers bits of info here and there and puts it together in nice documents.
Many of the mechanics are not known by us either, but we can look them up in the code, should the demand arise.
Much of the 'hidden knowledge' can probably be found if you use the search function on this forum.
If you want to know something, just ask. Someone is bound to answer. Either me or some of the forum addicts
