[rich2202]

The problem is that you need 2 things:

1) RoboRio code to send LED command to the Driver Station
2) Something on the Driver Station you can control

With WPILIB C++, your outputs to the Driver Station are limited to: Smart Dashboard, and Joystick.

Thus, the only thing that you can control off screen using WPILIB is a joystick.

Under Joystick, you can Set Rumble, and Set HID.

Ok, so now you need a joystick controller that can decode Rumble and/or HID. Unfortunately, I couldn't find a USB joystick encoder board that could decode either.

So, your best bet is to get a Joystick with a Rumble feature, and when you are in the target area, cause the joystick to rumble. The Rumble may be superior to the LED because the Driver doesn't have to look for the LED.

Note: There are a lot of USB LED controllers you can buy (#2), but you would need your programmers to write the library code to control it.