I was refering to "normal keys" like letters, numbers, funcion keys (F?), etc...Control, Alt, Shift, are exception, for example.
Yeah, I know the way it really works. I was talking about how it behaves.I only was saying that in fact, the computer won't recieve signal, for example, for three numbers at once.
It's very annoying in any FPS when I use Ctrl for crouch, since I can crouch and move forward+right, but not crouch and move forward+left.