V.MEM is the same as V.TAPE.
I assume the Beocenter and the 9300 are in different rooms. If that's the case set the both Beocenter and the Beovision to Option 2.
When in the Beocenter 9300 room, simply call V.MEM from your Beo4, or V.Tape from a Beolink remote, and all the commands will be transferred. It is however difficult to control an Apple TV without a screen.
On the Beocenter 9300 itself, there is no Key for V.TAPE. But I think you can use the AUX button, followed by a number.
I think AUX then 1 (pressed within 1 second) is for TV.
AUX then 2 is for sat...