title: Send information from one android client to many android clients
body: <p>Could you tell me, please, how could I send Information from one android client to many android clients in these two possibilities shown below?</p>
  
  <blockquote>
    <p>1) the request from the client goes to the server and from the server to the other clients. Here I know that from the client to the server I can use webservice. My doubt is how to send information from the server the clients when the server has certain information. In this case the clients don't know when they needs to fetch information from the server. Just the server knows when it has to send information to the clients.</p>
    
    <p>2) the request goes direct from the client to the other clients.</p>
  </blockquote>