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That statistic is not accurate and usually includes how many unique IP's have loaded a page over a given amount of time, usually five minutes. Every time they load a page the time resets. If someone for example loads a page from a search engine link and quickly goes back to the search engine results they would still be counted as online for the next 5 minutes.
AFAIK it's not available here, on larger forums like this unneeded and pointless features like that are typically disabled to conserve server resources.