Easy trigger!
While this forum is full of knowledgeable people (glances in mirror), we need to be a little careful about doling out advice if we're not certain that we're correct. I know that many people come here to get good honest advice to make buying decisions and there's enough bad information being given out in shops already!
BeoPort will only work to compliment a modern BeoSound audio system with support for N.MUSIC & N.RADIO. The BeoPort itself is not an audio master and will not drive a link network. If a BeoSound 3000(new), 3200, 9000(new), or 4, or a BeoCenter 2 is not present as an audio master, the N.MUSIC & N.RADIO will not be brought onto the network. BeoPort will not work. I fear this was never made clear enough to dealers as I myself and many of my colleagues have found out "the hard way" that BeoPort needs an audio master.
If you have a BeoMaster 4500, your only option to bring music from your computer is as a simple AUX input with no control, just as you would an iPod (also an option, of course).
Otherwise the above information as to the compatibility with computer platforms in correct.
There is scarcely anything in this world that some man cannot make a little worse and sell a little more cheaply. The person who buys on price alone is this man's lawful prey. - John Ruskin