IBM TopView

TopView is a text-mode PC DOS multitasking, object oriented windowing environment written by IBM and introduced in August 1984 and made available in February 1985. TopView was announced in order to provide an environment that users could run more than one application at the same time on a PC. Many industry leaders and insiders speculated on what was happening in the confidential confines of IBM Boca Raton. IBM demonstrated an early version of the product to key customers before making it generally available, around the time they shipped their new PC/AT computer.