ref: c116550e6a41572796e4db65e4f6acbcb3d9d6f8
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.
};