heart_beats - return an array of objects with active heartbeats

object array heart_beats();

Returns an array of all the objects with active heart_beats.  This efun
is only available if PACKAGE_CONTRIB is defined.

See also:
 heart_beat,
 set_heart_beat,
 query_heart_beat

 Tim Hollebeek  Beek@ZorkMUD, Lima Bean, IdeaExchange, and elsewhere
