ref: 8a788aea84aad3bfbd5b39d78c1925654f3b9e14
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.
};