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There are no cheats for Left4dead.
You can't.
Nope!
Press the esc button on your keyboard
The armor cheat press ~(tilde) or \ (button above tab) to open the console then type this cheat: SetPCCanUsePowerArmor 1 (1 for use 0 for not use)
To get the cheat box to close you press esc on your keyboard, or after you enter the cheat you press return. (I'm not sure about the second one)
At the main menu, you hold down the INSERT button on your keyboard, then click on the words "Main Menu."
You can get them at the helitours in lower algonquin, or you can spawn an Annihilator (police helicopter) by dialing 359 555 0100 on your cellphone (cheat)
how to cheat money
press the second button on the keyboard next to the 1 and type in neverrunoutofshots
you hit the button directly below the escape button Esc it looks like this ~
You type them straight into the game using the keyboard. There is no console or anything similar. An example of this is for the armor cheat. To get 100 armor, you write tortoise into the game while playing. The input from your keyboard will still move your character around and perform actions such as getting in a car if they are nearby when you are typing in the cheats.