title: Can multiple sidekiq instances process the same queue
body: <p>I'm not familiar with the internals of Sidekiq and am wondering if it's okay to launch several Sidekiq instances with the same configuration (processing the same queues).</p>
  
  <p>Is it possible that 2 or more Sidekiq instances will process the same message from a queue?</p>
  
  <p>UPDATE:<br>
  I need to know if there is a possible conflict, when running Sidekiq on more than 1 machine</p>