Hello: It is possible to activate the car alarm or low the windows via canbus?

Question

I am trying to set the alarm of my car and low the windows (or at least one) via Canbus. I am using an Arduino UNO microcontroller and its corresponding Canbus Shield. So far I've been able to read from ECU (RPM, Speed, etc), but I do not know what code I should send through the canbus so the ECU executes the desired actions.