title: Vert.x cluster Eventbus cross processes
body: <p>Does any body have some info, links, pointer on how is cross process Eventbus communication is occurring.  Per documentation I am concluding that multiple Vert.x (thus separate JVM processes) could be clustered on and communicate via Eventbus.  However, there are little to none documentation on how to achieve it. </p>
  
  <p>Looking into DOCs, I can see that  publish/registerHandler methods take address as a String what works within a process, but I can not wrap my head around on how it works cross processes and how to register and publish to address, does it work over HTTP , TCP ?   From API perspective do I need to pass port and process signature ?</p>