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 From:  "Dave Warren" <MailList at devilsplayground dot net>
 To:  A dot L dot M dot Buxey at lboro dot ac dot uk, "Chris Buechler" <cbuechler at gmail dot com>, "Manuel Kasper" <mk at neon1 dot net>, m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Monowall in the News.
 Date:  Tue, 02 Aug 2005 10:58:14 -0600
> the multicast server would continually send out the image, forever
> looping
> and , at the beginning it sends out a 'start of image' message. the
> multicast
> 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
> incoming 
> image to file.  This way 50000 folk could download the 600mb file at
> the
> same time and the server would only ever see.... lets say 1Mb or 2Mb or
> traffic
> on its uplink. 

This is frequently done when ghosting a ton of computers over a LAN. 
Unfortunately it's not practical on the internet.