mmh , see if i can add a better explanation by means of an analogy.
Imagine we are all playing counterstrike for a big clan, and are all in different locations or "headquarters" Team speak is not working but we have setup a projector at each location where someone is monitoring play and is updating the events using Mirc so that all those logged in can see the updates as they happen.
e.g "terrorist seen at bombsite A with Sniper rifle"
all other team members would see this straight away and could formulate a plan of action and send that a s a response. eg " a and b use smoke - c and d flash bang, e f and g rush etc. start in 1 min .
That is the idea behind it.