Next-to-leading order corrections to e+e- → four jets

A general purpose Monte Carlo program for calculating the next-to-leading order corrections to arbitrary four-jet quantities in electron-positron annihilation is presented. In the current version of the program, some sub-leading in color terms are neglected. As an example, the four-jet rate in the Durham scheme as well as the Bengtsson-Zerwas angular distribution at Ο(αs3) are calculated and the results are compared to existing data. (author)