public function keyDown($char, $modifier = null)
    {
        $this->getDriver()->keyDown($this->getXpath(), $char, $modifier);
    }
public function keyDown($char, $modifier = null)
    {
        $this->getDriver()->keyDown($this->getXpath(), $char, $modifier);
    }
public function keyDown ( $ char , $ modifier = null ) { $ this -> getDriver ( ) -> keyDown ( $ this -> getXpath ( ) , $ char , $ modifier ) ; }
Pressed down specific keyboard key.

@param string|int $char     could be either char ('b') or char-code (98)
@param string     $modifier keyboard modifier (could be 'ctrl', 'alt', 'shift' or 'meta')
Pressed down specific keyboard key .