Here's a bit more detail from The Old New Thing blog about Windows 3.11: https://devblogs.microsoft.com/oldnewthing/20100517-00/?p=14013 https://devblogs.micros

Here's a bit more detail from The Old New Thing blog about Windows 3.11: https://devblogs.microsoft.com/oldnewthing/20100517-00/?p=14013 https://devblogs.microsoft.com/oldnewthing/20100517-00/?p=14... It includes: > As you might suspect from its name, the virtual machine manager created virtual machines. Inside the first virtual machine ran a copy of Standard mode Windows. ... The other virtual machines each ran a copy of MS-DOS and were responsible for your MS-DOS sessions. ... It’s kind of stunning to realize that Enhanced mode Windows was really a completely new operating system with multiple virtual machines, pre-emptively multi-tasked with virtual memory. I think it's quite interesting that, on that version of Windows, all the Windows programs were only cooperatively multitasked while all the DOS programs were pre-emptively multitasked.