The Replicator lets you distribute large numbers of files to
many people efficiently. The software automatically
downloads just the changed files and deletes ones no longer
part of the distribution.
Unlike other similar tools, all it requires is an ordinary
HTTP website. It requires no code to run on the server.
It can also work with CDs, and LANs.
Custom configured for each customer. Not free. Registration
includes help in setting up the configuration file.
See http://mindprod.com/webstarts/replicatormanual.html
to read how it works.
See http://mindprod.com/webstarts/replicator.html
to see it in action to download the Mindprod.com site and keep
it up to date.
Why the spectrograph rainbow spectrum?  Darned if I can
remember.  Perhaps the lines just represent the various
files it distributes.