title: Socket.io how to send a message to anyone?
body: <p>I'm doing my first app with socket.io and I want to send a message to any user. I know broadcast function, but I want to send a message to ANYONE. I've seeked and there's a way: using io.sockets.emit, but I don't know where I have to write that code because I'm using express on node.js and I receive in my function a socket (the current user).</p>
  
  <p>Thank you.</p>