The connection may have only one producer and one listener. If so, then the connection is said to be 1-to-1. In many cases, this would imply one dagent.
The connection may have one producer and many listeners. If so, then the connection is said to be 1-to-M. A broadcasted message from one dagent to many dagents is one special case of a 1-to-M connection.
The connection may have many producers and only one listener. If so, then the connection is said to be M-to-1.
The connection may have many producers and many listeners. If so, then the connection is said to be M-to-N. Here information from many dagents can be directed to many other dagents.