It's used when you want to perform an element search starting at a particular element. For example, if you want to get all the rows from a table, first you retrieve the element ID for the table. Then you use this as the starting point for your subsequent find operation, like this -- $sElement = _WD_FindElement($sSession, $_WD_LOCATOR_ByXPath, "/html/body/table") $aRows = _WD_FindElement($sSession, $_WD_LOCATOR_ByXPath, "//tbody/tr", $sElement, True)