title: How can I display dual screens in PHP web applicatoin
body: <p>I have a POS software developed in PHP and running as a web application.
  I need to have dual monitors, one facing the employee with full details (sales screens showing heaps of options) and another monitor facing the customer with summarized information (ex. item, price list only) </p>
  
  <p>How can that be achieved? </p>
  
  <p>Many thanks</p>