title: How can I send data to client-side after an API call when the caller is in another application
body: <p>I have 2 web apps. One web app acts as a host (lets label as Host). All Web APIs resides here. Then the other web app calls those Web APIs (lets label as Client).</p>
  <p>What I'm trying to accomplish is this:
  Client calls a Web API using Jquery Ajax in Host and host processes this. After successful process, I want to be able to send some message in the HOST's client-side so I can update some UI.</p>
  <p>That's the part I am unsure about. To notify the client-side of the Host so I can do some changes in UI, when the caller is in another app. I can't think of a way to pass some message so I can raise some popup, change some text, etc.</p>