title: BPMN notifications in the same pool
body: <p>So I understand that if I want to notify about something to another pool, I can have a task named "notify client about succesful purchase".
  My question is, what happens when I want to send a notification among lanes?</p>
  
  <p>For example if in the same pool I have a seller and an supervisor, and the seller has to notify the administrator that there is an order on the way. Can this be a task? or in a pool you don't have to notify anything and just draw the flow of the process's entity (in this case the order)?</p>