title: How to Implement Application server
body: <p>I have to implement a client-server architecture where there are many android client located at different places querying the application server (running all the time (24x7)) and which will do task accordingly and reply to clients. But I don't know what exactly application server is and how to implement it and what is easiest and quickest way to implement this. I am running out of time that is why posting this question otherwise I would have gone through lot of tutorials instead.
  The server code is to be written in php/c#/java.</p>
  
  <p>Any quick help is highly appreciated.</p>