As you are a silver member - much appreciated! - have you looked in
our user manual collection on the site? The version in English is for
the older Beo4 with an AV button, but if you know some other languages,
for example the German one is for a later model.
Anyway, the manuals for the Beo4 aren't (and can't be) very
comprehensive because of the vast number of functions. You will usually
find more details in the user manuals for the devices you want to
control.