服务器可以直接命中客户端

Question

I have a small requirement in PHP as below. Some thing like chat.

For eg there are 2 users A & B.

When "A" clicks on "Chat" link. "B" should automatically gets one javascript popup.

Is there any way of doing this except following. - One JS script runs continuously with AJAX. I dont want to happen client-server interaction continuously.

Is there any way for server sending status to browser directly?.

Thanks in advance.

Answer 1

Are you worried about wasting bandwidth? Why not try out XMPP? There are php libraries as well.