ref: 4a1fc5ccb596a0f88f465b81a638f0068e82f0b9
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.
};