   gl_ModelViewMatrix vs matView
  Hello people,I'm writing a shader program in GLSL using Rendermonkey, I know that there are some predefined matrices in GLSL like "gl_ModelViewMatrix" and "gl_ModelViewProjectionMatrix" but I can also define a predefined matView matrix in RenderMonkey too, so could some one please tell me what are the differences between them?   
  gl_ModelViewMatrix = glMatrixMode( GL_MODELVIEW );glLoadMatrixf( A ); // typically where the object/or camera is in the world (ie whats gonna appear on screen)gl_ProjectMatrix = glMatrixMode( GL_PROJECTION );glLoadMatrixf( B ); // typically how things appear onscreen eg are things far away small or whatnotgl_ModelViewProjectionMatrix =A*B (or B*A i forget)thusgl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;is A*B*vertex;basically a user defined matrix is just the same, its just a way of telling the card heres a 4x4 matrix of numbers that u will perform some clculations onvec4 result = mat * vertex;;  thank you   