How to set Num Lock state to true at game start?

I have a game I'm creating to learn Unity, in co-op mode, the PlayerTwo is controled by KeyPad Numbers, but it only works if Num Lock is activated. Is there a way to activate Num Lock from start? Or it is easier to change something in the PlayerTwo script? I tried using this, but it didn't work and I didn't understand https://answers.unity.com/questions/19112/how-to-get-and-set-the-state-of-numlock.html