Hi,
Here is where the confusion may come from.
Let's say you have a sky box (a stb). With the Beo 5, it is still controled by the PUC or STB-C from the TV itself.
The difference, is that you can configure the Beo5 and tell it that behind DTV there is a sky box.
What it then does is display on the screen buttons with names that correspond to the Sky box features. For example, Instead of Go 1 for Info, you'll have an "Info" button on the Beo 5.
That said, it will still send a Go-1 signal, which will be interpreted by the TV and the PUC will convert it into the "Info" code for the Sky Box.
Beo5 will be able to control other devices, not through the PUC but it does seem reserved to "environment" devices, such as light and curtains, etc...
p.