no idea when the server receives a new message In previous example we solved it by: Client request for new messages on fixed regular intervals Crazy number of request. Imagine 100 chat clients requesting new messages every second. That’s 100 x 60 = 6000 requests and responses per minute! car back seat analogy imagine u hv 5 kids at the back of your car, n each and every one of them asking you are we there yet, are we there yet are we there yet.. n u hv to reply no, we’re not there yet. no, we’re not there yet for 5 times Sunday, September 8, 13