OSD is for "On Screen Display", basically, it's what appears temporarily in your TV when you switch channel or change the volume. It's a way if displaying "passive" information that doesn't necessarily require all of your attention, doesn't need a specific log, but which is nice to know anyway if you happen to look in that direction.
LanOSD can also forms a network with it's other LanOSD friends running in other machines close by, and decide which one(s) are supposed to display messages. Each machine has a priority, and the machines that have the highest priority at any given time displays the messages.
LanOSD is Scriptable, so you
Version 1.0b4: Release notes were unavailable when this listing was updated.
Mac OS X 10.3 or later