Chocolatey brought a command-driven package workflow to Windows by combining NuGet-style package metadata with PowerShell automation for installing and managing ordinary Windows software.
IBM and Microsoft designed OS/2 as the protected-mode successor to DOS, but technical compromises, a changing PC market and the rise of Windows fractured the alliance and left OS/2 without platform control.
Windows NT replaced the assumptions of DOS-era Windows with a 32-bit protected architecture built around processes, virtual memory, security, portability and a modular executive.