title: How to show asynchronous operations on UML Activity diagram
body: <p>I am about to draw/document for some client-server connection establishing code to better understand it. There are several operations that are done asynchronously in separate threads (connecting threads, data receiving threads, etc).</p>
  
  <p>Should I show them on separate diagrams? I would prefer to have it on a single diagram to grasp overall view but don't know how to represent it on Activity diagram.</p>