Sequent Computer Systems Inc, Beaverton, Oregon has decided to go to war on all Compagnie des Machines Bull SA’s proprietary mainframe and minicomputer bases, and to that end has acquired Open Tool International BV, a Dutch software company described as the sole commercial provider of a complete set of mainframe- or mini-to-Unix migration tools for DPS 4000, DPS 6000, DPS 7000 and DPS 8000 and 9000, including an interface from the IDS2 database management system to Oracle and Informix relational databases. The company reckons that plundering the Bull base could be worth as much as $100m in Europe alone. Terms of the acquisition agreement and financial details of Open Tool have not been disclosed.