Can you fit that into your four letter code?

你能把它放入你的四字母代码中吗？

You turn it on and you had to type a word or a set of code letters or numbers, whatever, and then that would lead to something else.

你打开电脑必须输入一个单词或一段代码或数字之类的东西，然后才能进入其他操作。