What does countVisitorsToFetch do in Live.getLastVisitsDetails?

I was going through the documentation of reporting API for Live.getLastVisitsDetails and found a parameter
countVisitorsToFetch in the method, but there is no mention of what it does. Was curious for what it does.
http://developer.piwik.org/api-reference/reporting-api#Live

In the code, \plugins\live\API.php I found:

@param bool|int $countVisitorsToFetch DEPRECATED (optional) Only return the last X visits. Please use the API paramaeter ‘filter_offset’ and ‘filter_limit’ instead.

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