  Under the assumption of a CSW generalization to loop amplitudes in N=4 SYM,
(1) We prove that, formally the S-matrix is superconformal invariant to any
loop order, and (2) We argue that superconformal symmetry survives
regularization. More precisely, IR safe quantities constructed from the
S-matrix are superconformal covariant. The IR divergences are regularized in a
new holomorphic anomaly friendly regularization. The CSW prescription is known
to be valid for all tree level amplitudes and for one loop MHV amplitudes. In
these cases, our formal results do not rely on any assumptions.
