Flex-PHP application using LCCS

I need to create an LCCS video/audio/text chat application which will be deployed on a website with PHP as back-end. Only 2 people can comunicate with each other. There are a few questions I have related to this:
Do I need to create different rooms for each user chat as 2 users can chat at a time?
Do I need to create these rooms on the fly using the PHP classes in LCCS SDK to enable dynamic room creations?
How do I interact with Flex and these Rooms? Do I need to create some PHP services which after creating a room, send the data to Flex, which Flex uses to initiate the chat application?
Any help would be appreciated and it would be good if someone can share URL to similar tutorial or example.

Thanks to all those links and comments were really very helpful. Regarding the Wiki link, point 6.c and 6.d mentions that
For each user and from your own system, get an user ID, a username, and an assigned role.
Generate an authToken by passing the required parameters to getAuthenticationToken. The token is a unique, signed string created from the your shared secret, the user's ID and username, and their assigned role.
Here we need to generate user ID and username on server side? Also how do I define roles using server side scripting?

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C

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