  We discuss an algorithm for the numerical evaluation of NLO multiparton
processes. We focus hereby on the virtual part of the NLO calculation, i.e. on
evaluating the one-loop integration numerically. We employ and extend the ideas
of the subtraction method to the virtual part and we use subtraction terms for
the soft, collinear and ultraviolet regions, which allows us to evaluate the
loop integral numerically in four dimensions. A second ingredient is a method
to deform the integration contour of the loop integration into the complex
plane. The algorithm is derived on the level of the primitive amplitudes, where
we utilise recursive relations to generate the corresponding one-loop off-shell
currents. We discuss the numerical behavior of the approach and the application
to the leading colour contribution in e+ e- --> n jets, with n up to seven.
