To use Microsoft's Win32 implementation, is to use Windows. lol. The Win32 API is an entrypoint to the OS. It's a bit more than an interface to the kernel. Like

To use Microsoft's Win32 implementation, is to use Windows. lol. The Win32 API is an entrypoint to the OS. It's a bit more than an interface to the kernel. Like saying .NET is the kernel. The kernel is important, but it's a ton of other stuff (like what ReactOS is rebuilding) that's needed.