Need suggestions or general information

I’m new to php and need some suggestions. I realize that web pages by nature are designed to to be simple in functionality. However let me describe what i want to do and you tell me if its possible.

The setting is an intranet(closed office situation), I want to develope a system where multiple users can enter(post) information. The information is examined and another web page is displayed. I can do this, no issue. The problem I have is, I want to make other pages being view by other clients change based on the actions of each client post. let me give you an example.

An office has 10 workstations displaying a web page. When one user presses a submit button the other 9 workstatons screens change color.

In my mind I need to be able to remotely refresh the web page of each workstation. serving up a different background color to nine of the other workstations. I do not know how to keep up with the workstation addresses and I do not know how to force a page reload. Is this possible in PHP?

Any thoughts(helpful ones) are greatly appreciated.

You may consider jquery/ajax instead of refreshing the page every couple of secs.
having a small script to process the query when a user logs in.

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