Noobish Question

Im fairly new to GMod, and I have been wondering, how do make it to where when you put in the code on the keypad, it opens a door?

If you’re using the non-wire keypad, which I am going to assume you do:
Download the keypad tool. Make a door that uses a numpad button. Spawn the keypad, and select that same numpad button.

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In other words, keypads work exactly like Buttons, only they have a code too.