The two companies have long agreed that the original DOS system they rode to fortune is about ready for pasture.

We know how to destroy the DOS system, that is easy.

As a result of the delay, a number of customers implemented DOS systems and committed significant investments to run them.

Normally in DOS operating systems, only one program can run at any given time.

A DOS system would require troubleshooting if either of these files became damaged or corrupted.

They split development of their DOS systems as a result.

By the early 1990s, Windows saw heavy use on new DOS systems.

Eventually, the manufacturers of major DOS systems began to include their own environment managers.

The DOS system for managing floppy storage was menu driven.

Windows 2.0 was still very dependent on the DOS system and it still hadn't passed the 1 megabyte mark in terms of memory.