glenable(0)-What does this mean?

Could some explain it. This didn't helped me: http://www.khronos.org/opengles/documentation/opengles1_0/html/glEn开发者_如何学Pythonable.html

As long as no valid GL enum has an actual value of 0 (which I really doubt), this will result in a GL_INVALID_ENUM error and otherwise do nothing.