If memory serves, the Xerox internet broadcast was implemented by sending
packets to the broadcast address on particular subnets. A seperate packet
had to be sent to each subnet.
Kevin D. Kissell
Fairchild Research Center
Advanced Processor Development
uucp: {ihnp4 decvax}!decwrl!\
>flairvax!kissell
{ucbvax sdcrdcf}!hplabs!/