title: Sending a message to all other instances of the application on the same network
body: <p>How do I send a message using multicast on the same network ?</p>
  <p>I am using C++, with the library boost. I have played around with the sender and receiver example.</p>
  <p>But I also have a few questions, I am new to networks and C++.
  The multicast port is set to 30001, is there any good reason for this ?</p>
  <p>The examples suggests that I use, for the sender:</p>
  <blockquote>
  <p>IPv4 239.255.0.1</p>
  <p>IPV6 ff31::8000:1234</p>
  </blockquote>
  <p>And for the receiver:</p>
  <blockquote>
  <p>IPv4 0.0.0.0 239.255.0.1</p>
  <p>IPv6 0::0 ff31::8000:1234</p>
  </blockquote>
  <p>Why those specific addresses ?</p>
  <p>Also in the receiver example, there is a section dedicated to joining the multicast address, is there a way to check if a new connection has showed up on this address ? to see what new instance joins or leaves the connection, is this possible ?</p>
  <p>But my main question is, if I were to send a message like Hello World from my computer running the example, would this show up on another computer on the same network ?</p>