Controlling RC Car with Arduino/Processing. Multiply keys at same time?

Hi!

Been doing a project that involvs controlling a RC car using the PC and keyboard. What I wanna do is controll the car using the Arrow keys. What I am using is Processing sending data from the usb unto the arduino that is then sending volt unto the PCB of the controll of the car.

What I am having problem with is that i can only send 1 keystroke at the time, so turn and forward wont work at the same time? Anyone that can link a good exampel of my problem or try to explain how the code should look like?

The Arduino Code right now: char PCdata; int pinright = 2; int pinleft = 4; int pinback = 7; - Pastebin.com
The Processing Code right now: import processing.serial.*;Serial myPort; char sendnumber;void setup() - Pastebin.com

// Johan H