Left 4 dead 1 & 2 How to Get Cheats

1.First Open Left 4 Dead 1 or 2 2.Go to Options And Keyboard/Mouse 3.Go to Allow Developer Console And if you Disabled Click enable 4.Push The (Comma`) And Type Your Cheats ENJOY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Just Push The ` comma button