Refresh game window when application is not active

I implement in the Game (first, I work in debug mode) a http server. From a html page, I send command in order to start or stop a car movment. But when I trigger actions from my web browser with the mouse, the Unity IDE is not the active application, and the Vehicle doesn’t move. I need to clic on Game window caption in order to make the vehicle moving.
How can I have the “update” without the focus ?
Best regards.

I found myself the answer (found by my son …)
Add a script line : Application.runInBackground = true;