I would imagine your game would have two frames (one hidden frame), and the hidden 
frame would contain scripts to check and update page.

In the bottom frame i see you might have two choices:

1. have a meta refresh which checks every 5 (or so) secs if a move has been made, and 
if detects a move, sends a refresh command to the top frame

2. have a php script which continually checks if a move has been made ( using sleep() 
function and set_time_limit() ), and if detects a move, sends a javascript command to 
browser, then continue detecting if changes have been made......

the implications of #2 (i would image), is the explorer icon will be constantly 
loading a page, so if you click stop, the game will cease

hope that helps

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