It can broadcast the cooldowns from any party member to any other party member who has the mod.

The way I have it set up is for a paladin and four shamans. On my paladin's screen I can see cooldowns and skill timers for the shaman's abilities. I have the mods installed and configured so that my paladin doesn't send any coold down info since I am looking at his screen anyway. One shaman sends cooldown info for stuff I use on all my shamans at once like Shocks, Chain Lightning, Elemental Mastery, etc... the other shamans only send cooldown info for individual use things, which at the moment is only Ressurection and Astral Recall.

I also grouped things like mana stream and healing stream totem that last the same amount of time. I only get a timer for the duration of healing stream from one shaman but the other totem is the same duration anyway.

You have to explicitly turn on the behavior in the mods, it is off by default.

I made a post with links in the Tips and Tricks and thread in general.