Perhaps people just objected with your spelling of Beovision Avant
Seriously - you must have one of the earlier model Beo4's. They don't have PC or any of its derivatives (L-PC and so on). On a Beolink 1000, you could send the same command with (TV) SHIFT-STORE, but I'm not aware of a similar trick on Beo4.... perhaps someone else knows?
I'm sorry I can't help you with your second question.