I had the satellite system installed last week and we are enjoying great tv; however, I didn't learn a lot about the pre-wiring. Here is all I can add:
Of the 2 coax jacks on the roof, one goes to the entertainment center and one goes to the bedroom tv.
Of the 3 coax cables in the entertainment center, one comes from the roof, but I don't know what the other 2 connect to. I suspect that one comes from one of the 2 satellite jacks on the utility panel (for use with a portable antenna). Maybe the other one goes to the satellite jack in the "basement" (to connect a basement-mounted tv).
I learned very little about the pre-wiring because very little info was needed to set up our system.