  We continue the study of n-point correlation functions of half-BPS protected
operators in N=4 super-Yang-Mills theory, in the limit where the positions of
the adjacent operators become light-like separated. We compute the l-loop
corrections by making l Lagrangian insertions. We argue that there exists a
simple relation between the (n+l)-point tree-level correlator with l Lagrangian
insertions and the integrand of the n-particle l-loop MHV scattering amplitude,
as obtained by the recent momentum twistor construction of Arkani-Hamed et al.
We present several examples of this new duality, at one and two loops.
