This is a special supervisor for Erlang (http://erlang.org/) that allows you to run child by schedule. For example, you may want to capture stock quotes from security exchange only from 8:00 UTC till 16:00 UTC. This code will keep your child running only at required time.
timed_supervisor.erl is intended for tracking for only one child at a time. It is impossible to add several children to it. Launch several timed_supervisors if you need several children.