sentences:  In 1993, PC DOS 6.1, MS-DOS 6.2 and PC DOS 6.3 were trumped by Novell's .Novell CEO Robert J. Frankenberg's strategy included "major trimming", selling off products like transactional database Btrieve and killing others such as Novell DOS and WordPerfect's multimedia Main Street children's titles.Novell licensed technology from Stac Electronics for use in Novell DOS and its Network operating system, NetWare.