is TexEnv bind to texture object ?

Well, most of it is in the Subject.

Ive got a strange comportement from openGl and I need to be sure of one thing : parameter set with TexEnv (GL_MODULATE, GL_REPLACE, etc) are NOT bind with texture objects (in other words : when you call bind, it does not change GL_TEXTURE_ENV_MODE).

Is that correct ?