Where do you find the codes? I found what was possibly a password in a note but after I entered the code I didn't notice any effect.

There's also phrases to decode the languages you find in some of the notes in the game.

Anyone know what the code Skarte-Hanzui does? I got it from glitching one of the small green enemies in E-Kur-Mah.

@sessh: You've got it in the wrong order! The yellow letter is the start of the code, not the end. The code is ISKART-EHANZU, and it opens a hidden pathway to another gun.

@ignisphaseone: Oh, okay. Damn, I'm an idiot. I had just assumed the code was right because the game let me input and activate it. Thanks for clearing this up.