  A framework to include triple collinear splitting functions into parton
showers is presented, and the implementation of flavor-changing NLO splitting
kernels is discussed as a first application. The correspondence between the
Monte-Carlo integration and the analytic computation of NLO DGLAP evolution
kernels is made explicit for both timelike and spacelike parton evolution.
Numerical simulation results are obtained with two independent implementations
of the new algorithm, using the two independent event generation frameworks
Pythia and Sherpa.
