How to create game rooms (webpages with dynamic links through IDs)

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Javascript

XML

PHP

Hello,

I have a webpage where users can play a very simple game in multiplayer mode.

They hit "play now" a new windows is opened , and at the second visitor is saved in XML (going to migrate to DB table to use IDs) that the "game if full" and does not allow more users play the game.

The thing is: I want to create a system where users can create new rooms, Instead handling the same page only with sessions variables. Something similar like if it was a web based chat, using webpage?id=.... (where that id is a field from "PlayRoom" SQL table.

I've seen some examples of web based chat's to implement the same system, but I'm a little confused.

Can you please give me some hints?

Sorry if this is a little confusing and/or incoherent but is honestly because I didnt used this kind of "dynamic pages".

Thanks in advance.