Answer by Motionreactor

Really simple solution is to make everything in your scene a child of a single GameObject (call it world if you like). Then from this 'world' GameObject you can broadcast to all children:

gameObject.BroadcastMessage("ReceiverFunction", msg)

and place a simple script in every child you wish to receive the message:

function ReceiverFunction(msg)
{
    //do something with msg
}