However, you can't use the method described in that article to solve this problem.
Check this project for more information In your case, if you/your company can afford it, I'd recommend Wt.
It can also handle pushing data to a web page using either ajax pull or web sockets.
Is it possible to push the data to the client rather than pull?
I really do not have any experience with php/ajax, so any tips on how to implement this would be great.
(Eg, a random number via PHP, your sales stats, your DOB, etc, wherever your imagination takes you!