If you want to take right results for visitor activity you need to use following parameters:
$siteId - unique site identificator, it sets at config file 'includes/config.php'
$apiKey - api key for your website
$displayType - it's a display options like at http://www.goingup.com/account/?ws=7c3hw
it can be:
1) titles- 'Show Titles'
2) urls - 'Show URLs'
$outputType - it's a type og your output, you need set it as 'XML', 'PHP' or 'JSON'
XML - return results at XML format, PHP - serialize array, JSON - JSON format
$from - if from is positive, the returned results will start at the from'th position in total results, counting from zero
$limit - if limit is positive, the number of returned results will be $limit, default value is 50