U, V and N are generally known as the camera vectors. U is your view vector. the camera looks into this direction. the V vector is a vector you choose. it has to be orthogonal to the U vector. finally the N vector is the cross product of U and V, thus forming a cartesian coordinate system. all that is left is to find out is the translation part... usually it is just the negative of the camera's position.
i don't know what E and Z are... could you clarify on that ? i assume that E is the eye or camera position ?