title: How to specify msg source and destination in OMNeT++
body: <p>In TicToc tutorial 13, the message destination is random. How can I specify the destination of the message? say I want it to get to <code>tic[5]</code> arriving from <code>tic[0]</code>. Then create another message with different source and destination e.g. from <code>tic[3]</code> to <code>tic[2]</code>.
  Also the paths are randomly selected between the nodes in this tutorial, so how can I modify this so the message can get to its destination using shortest path?</p>