i would have a 'last_logged_in' date against a user and every time a user
logs in, this timestamp is updated - once  you have this time in the
database, then define an offset (say 2 mins or 180 seconds) and query
against the database for a count/users that are logged in..

On Tue, Jan 18, 2011 at 1:26 PM, Vikos <[email protected]> wrote:

> Or if the Presence information doesn't matter...
>
> make a shoutbox...
>
> On Jan 18, 9:24 am, Gabriel Petchesi <[email protected]> wrote:
> > You should look into server push technologies to get updated information
> > from the clients.
> http://en.wikipedia.org/wiki/Push_technologyhttp://en.wikipedia.org/wiki/Comet_(programming)<http://en.wikipedia.org/wiki/Push_technologyhttp://en.wikipedia.org/wiki/Comet_%28programming%29>
> >
> > As for storing user state use memcache with some locking mechanism to see
> > which users are active or not.
> >
> >     gabriel
>
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