Send a sequence of keys via keyboard events
        
        Usage: C{keyboard.send_keys(keyString)}
        
        @param keyString: string of keys (including special keys) to send

def send_keys(self, keyString):
        """
        Send a sequence of keys via keyboard events
        
        Usage: C{keyboard.send_keys(keyString)}
        
        @param keyString: string of keys (including special keys) to send
        """
        assert type(keyString) is str
        self.mediator.interface.begin_send()
        try:
            self.mediator.send_string(keyString)
        finally:
            self.mediator.interface.finish_send()