I am making a game of multiplayer poker
firstly the list of different room displays, then user selects a particular room and joins it.
but when the user joins that room for him it's empty , he/she is not able to see the game of players already playing in that room
how to solve this problem????
You should be using SharedObjects and populating list of users and when new users join sync that list so that everyone knows who all are there in that room.
There are some tutorials which i feel migth be relevant to you though i have not gone through them - should be helpful
http://fmsguru.com/tutorials.cfm?tab=fms&p=4&o=d (check out Tutorial 34/36/37)