beware though
although global.php seems small now, it calls upon function.php which is around 70Kb+ added to every one of your pages to which you require the global.php. Not just the size, imagine the increase in server load.
If you are not concerned about tracking their location, I dont think it is necessary anyway, Just so long as your users do not click logout and then go surf the rest of your site, their session will not have expired straight away and they would still appear in the online list.
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