Turn motors off, using code for cooling? (Itead Dual Stepper Motor Shield )

i want buy itead dual stepper motor driver shield one:
http://www.robotshop.com/dual-stepper-motor-driver-shield-arduino.html
can turn motors off, using code, when not in use can cool off?

what code use power down motor when @ rest?  sample code give this:

quote

int dirpin1 = 3;
int stepperpin1 = 2;
int dirpin2 = 7;
int stepperpin2 = 6;

void setup()
{
   pinmode(dirpin1, output);
   pinmode(stepperpin1, output);
   pinmode(dirpin2, output);
   pinmode(stepperpin2, output);
}

void step(boolean dir,int steps)
{
   digitalwrite(dirpin1,dir);
   digitalwrite(dirpin2,dir);
   delay(50);

  for(int i=0;i<steps;i++)
{
    digitalwrite(stepperpin1, high);
    digitalwrite(stepperpin2, high);
    delaymicroseconds(100);
    digitalwrite(stepperpin1, low);
    digitalwrite(stepperpin2, low);
    delaymicroseconds(100);
  }
}

void loop()
{
  step(true,1600*5);
  delay(500);
  step(false,1600*5);
  delay(500);
}

you can power down, note if motor won't held in position , free turn.

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