ref: d09cf07a82cf4ffb846a31d0384e774b4c4661e1
dir: /module/grid/announce.m/
Announce: module {
PATH: con "/dis/grid/lib/announce.dis";
init: fn();
announce: fn(): (string, ref Sys->Connection); # find a local address, any port, and return its name and an announced connection.
};