/**
  * Start Instances 
  * Starts an instance that uses an Amazon EBS volume as its root device.
  * Instances that use Amazon EBS volumes as their root devices can be quickly stopped and started.
  * When an instance is stopped, the compute resources are released and you are not billed for hourly
  * instance usage. However, your root partition Amazon EBS volume remains, continues to persist your
  * data, and you are charged for Amazon EBS volume usage. You can restart your instance at any time.
  * @see http://docs.amazonwebservices.com/AWSEC2/2009-11-30/DeveloperGuide/ApiReference-Query-StartInstances.html
  * @param mixed $request array of parameters for Amazon_EC2_Model_StartInstancesRequest request
  * or Amazon_EC2_Model_StartInstancesRequest object itself
  * @see Amazon_EC2_Model_StartInstances
  * @return Amazon_EC2_Model_StartInstancesResponse Amazon_EC2_Model_StartInstancesResponse
  *
  * @throws Amazon_EC2_Exception
  */
 public function startInstances($request)
 {
     if (!$request instanceof Amazon_EC2_Model_StartInstancesRequest) {
         require_once 'Amazon/EC2/Model/StartInstancesRequest.php';
         $request = new Amazon_EC2_Model_StartInstancesRequest($request);
     }
     require_once 'Amazon/EC2/Model/StartInstancesResponse.php';
     return Amazon_EC2_Model_StartInstancesResponse::fromXML($this->_invoke($this->_convertStartInstances($request)));
 }
 /**
  * Start Instances 
  * Starts an instance that uses an Amazon EBS volume as its root device.
  * Instances that use Amazon EBS volumes as their root devices can be quickly stopped and started.
  * When an instance is stopped, the compute resources are released and you are not billed for hourly
  * instance usage. However, your root partition Amazon EBS volume remains, continues to persist your
  * data, and you are charged for Amazon EBS volume usage. You can restart your instance at any time.  
  * @see http://docs.amazonwebservices.com/AWSEC2/2009-11-30/DeveloperGuide/ApiReference-Query-StartInstances.html      
  * @param mixed $request array of parameters for Amazon_EC2_Model_StartInstances request or Amazon_EC2_Model_StartInstances object itself
  * @see Amazon_EC2_Model_StartInstances
  * @return Amazon_EC2_Model_StartInstancesResponse Amazon_EC2_Model_StartInstancesResponse
  *
  * @throws Amazon_EC2_Exception
  */
 public function startInstances($request)
 {
     require_once 'Amazon/EC2/Model/StartInstancesResponse.php';
     return Amazon_EC2_Model_StartInstancesResponse::fromXML($this->_invoke('StartInstances'));
 }