The BS3 can control multiple stb etc, it has 6 av ports each of which can have a different source and associated IR stb control. You can have the same stb control on more than one of the av ports.
Cheers
Peter
My B&O - BS3, BV4-50, Beomedia 1, BS3200, DVD1, BL8000, BL6000, BL3, BL2, BL7.4