(1) Virtualization
If you opened your eyes in 1964, you would find that IBM’s groundbreaking System/360 mainframe had already achieved virtualization, allowing multiple users and environments to work on a single machine through CPU time-sharing mechanisms. After all, computers were expensive at that time; if each user had to queue for their programs to execute one by one, the utilization efficiency of the mainframe would be too low. This marks the beginning of virtualization.
If you opened your eyes in 1989, you would see that Microsoft began developing the Windows NT operating system. At that time, Microsoft was still pretending to collaborate with IBM on the OS/2 operating system compatible with PC machines. Therefore, Microsoft’s product managers and project managers required the chief designer of the Windows NT kernel, Dave Cutler, to ensure that the new operating system kernel needed to support both OS/2 applications and Windows applications.
Cutler thought to himself,