Corollary Inc, Irvine, California and The Santa Cruz Operation Inc, Santa Cruz have finally put a formal seal on their partnership in the development of multi-processing Unix software based on SCO Xenix System V and SCO Unix System V/386: Corollary has already shipped the first product out of the agreement, the multiprocessing version of SCO Xenix that has gone to Zenith Data Systems for its Z-1000 series; under the contract, Corollary has access to Santa Cruz kernel source code and adds proprietary multiprocessing technology to create the 386/smp symmetrical multiprocessing kernel, and the product is distributed by both Corollary and Santa Cruz to Santa Cruz customers with the appropriate hardware; it is non-exclusive, but Santa Cruz endorses Corollary’s extensions as the first choice multiprocessing Xenix.