> the multicast server would continually send out the image, forever
> and , at the beginning it sends out a 'start of image' message. the
> client would simply be told which image to listen for (from that IP, or
> via SAP)
> and , once it received the 'start of image' message, would save the
> image to file. This way 50000 folk could download the 600mb file at
> same time and the server would only ever see.... lets say 1Mb or 2Mb or
> on its uplink.
This is frequently done when ghosting a ton of computers over a LAN.
Unfortunately it's not practical on the internet.