Serial communication to 2 outputs

Hello all !

I have a little noobish newbie question

I've made a flash interface that communicates with the Arduino Board with the serialServer - like in the screen above. So far so good. By adjusting a slider in flash I can modify the output voltage via PWM on digital output (10).

Now I want to modify another digital output (9) at the same time via serial communication. Is this possible?

Wim