Hi,

>When someone updates their in/out status I want that change to
>appear (some lag ok) on all other open in/out screen.  
>
Well, one approach, and interestingly this avoids any significant lag, 
is to use Comet. This is a long-lived connection between browser and 
server, that the server uses to send events to the client. Orbited 
(http://brbx.com/orbited/) is a library that I've successfully used to 
do Comet with TurboGears.

I used this to make a card game. If you're interested, it's 
http://pajhome.org.uk:8000/

Paul

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