/**
  * Monitor Instances 
  * Enables monitoring for a running instance.
  * @see http://docs.amazonwebservices.com/AWSEC2/2009-11-30/DeveloperGuide/ApiReference-Query-MonitorInstances.html
  * @param mixed $request array of parameters for Amazon_EC2_Model_MonitorInstancesRequest request
  * or Amazon_EC2_Model_MonitorInstancesRequest object itself
  * @see Amazon_EC2_Model_MonitorInstances
  * @return Amazon_EC2_Model_MonitorInstancesResponse Amazon_EC2_Model_MonitorInstancesResponse
  *
  * @throws Amazon_EC2_Exception
  */
 public function monitorInstances($request)
 {
     if (!$request instanceof Amazon_EC2_Model_MonitorInstancesRequest) {
         require_once 'Amazon/EC2/Model/MonitorInstancesRequest.php';
         $request = new Amazon_EC2_Model_MonitorInstancesRequest($request);
     }
     require_once 'Amazon/EC2/Model/MonitorInstancesResponse.php';
     return Amazon_EC2_Model_MonitorInstancesResponse::fromXML($this->_invoke($this->_convertMonitorInstances($request)));
 }
 /**
  * Monitor Instances 
  * Enables monitoring for a running instance.  
  * @see http://docs.amazonwebservices.com/AWSEC2/2009-11-30/DeveloperGuide/ApiReference-Query-MonitorInstances.html      
  * @param mixed $request array of parameters for Amazon_EC2_Model_MonitorInstances request or Amazon_EC2_Model_MonitorInstances object itself
  * @see Amazon_EC2_Model_MonitorInstances
  * @return Amazon_EC2_Model_MonitorInstancesResponse Amazon_EC2_Model_MonitorInstancesResponse
  *
  * @throws Amazon_EC2_Exception
  */
 public function monitorInstances($request)
 {
     require_once 'Amazon/EC2/Model/MonitorInstancesResponse.php';
     return Amazon_EC2_Model_MonitorInstancesResponse::fromXML($this->_invoke('MonitorInstances'));
 }