Oh, and of course Internet standards based players are available for
all platforms, right?
Yes (for a larger value of "all" than RealPlayer supports). vic/vat/rat
are portable to many UNIX variants, and also run under Windows. I
think that MacOS is the only orphan in this scenario, but ISTR there
are protocol proxies available that will gateway to something MacOS
can handle (assuming they can't directly view H.261 multicast with
some other tools).
--lyndon